WO2004103345A2 - Particules stabilisees en taille par copolymere diacide - Google Patents
Particules stabilisees en taille par copolymere diacide Download PDFInfo
- Publication number
- WO2004103345A2 WO2004103345A2 PCT/FR2004/001191 FR2004001191W WO2004103345A2 WO 2004103345 A2 WO2004103345 A2 WO 2004103345A2 FR 2004001191 W FR2004001191 W FR 2004001191W WO 2004103345 A2 WO2004103345 A2 WO 2004103345A2
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- WO
- WIPO (PCT)
- Prior art keywords
- particles
- weight
- particles according
- active material
- dispersion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K9/00—Medicinal preparations characterised by special physical form
- A61K9/14—Particulate form, e.g. powders, Processes for size reducing of pure drugs or the resulting products, Pure drug nanoparticles
- A61K9/141—Intimate drug-carrier mixtures characterised by the carrier, e.g. ordered mixtures, adsorbates, solid solutions, eutectica, co-dried, co-solubilised, co-kneaded, co-milled, co-ground products, co-precipitates, co-evaporates, co-extrudates, co-melts; Drug nanoparticles with adsorbed surface modifiers
- A61K9/146—Intimate drug-carrier mixtures characterised by the carrier, e.g. ordered mixtures, adsorbates, solid solutions, eutectica, co-dried, co-solubilised, co-kneaded, co-milled, co-ground products, co-precipitates, co-evaporates, co-extrudates, co-melts; Drug nanoparticles with adsorbed surface modifiers with organic macromolecular compounds
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K9/00—Medicinal preparations characterised by special physical form
- A61K9/14—Particulate form, e.g. powders, Processes for size reducing of pure drugs or the resulting products, Pure drug nanoparticles
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K9/00—Medicinal preparations characterised by special physical form
- A61K9/48—Preparations in capsules, e.g. of gelatin, of chocolate
- A61K9/50—Microcapsules having a gas, liquid or semi-solid filling; Solid microparticles or pellets surrounded by a distinct coating layer, e.g. coated microspheres, coated drug crystals
- A61K9/51—Nanocapsules; Nanoparticles
Definitions
- the present invention relates to particles based on at least one active material stabilized by adsorption of a new dispersing agent at their external surface.
- the active materials having a very reduced solubility, or even zero in the usual solvents, such as for example water, raise difficulties in terms of formulation.
- the conventionally adopted solution consists in incorporating them into the formulation considered in the form of a dispersion of nanoparticles.
- These nanoparticle dispersions can in particular be obtained by 0 techniques of the precipitation, solvent tilting, emulsification type and more conventionally by grinding the active material in dispersion in a liquid medium.
- the term nanoparticle designates the submicron particles obtained by grinding or by techniques such as those mentioned above.
- this insoluble active ingredient is a biological active ingredient
- 5 particles thus obtained can prove to be particularly decisive for its activity. Indeed, a too large size, and in particular greater than 1 ⁇ m can be detrimental to its bioavailability at the level of the site to be treated, or even significantly affect its biological activity.
- the size of particles dispersed in a liquid medium is 0.0 likely to change over time.
- this size can increase in situ within the dispersion, following a partial solubilization of the active material and its subsequent recrystallization in the form of crystals or particles of larger size, this phenomenon also being called ripening.
- the increase in particle size can also result from a phenomenon of particle aggregation in the dispersion. In most cases this aggregation is irreversible.
- US Patent 5,145,684 describes nanoparticles consisting of an insoluble crystalline compound and a non-crosslinked surface stabilizing agent, such as polyvinyls
- Patent US 6,270,806 describes, for its part, particles of insoluble compound, having adsorbed on their surface lipid derivatives of polyethylene glycol (PEG) as stabilizing agent.
- PEG polyethylene glycol
- PEGs are known to also be good solvents, which can be detrimental to the manifestation of prolonged stability of the corresponding particles. PEGs can, in view of their good solvent power, promote ripening.
- the present invention specifically aims to provide a more effective solution based on the choice of a new surface stabilizing agent.
- anionic copolymers of dicarboxylic acid prove to be particularly advantageous for effectively and rapidly controlling the size of particles in dispersion in a liquid medium, such as for example water.
- the invention thus makes it possible to obtain particles, in particular of submicron size, having excellent stability and this for a wide range of active materials insoluble in water, and in physiologically acceptable solvents or mixtures thereof.
- the present invention relates, according to a first aspect, particles, in particular of submicron dimension, of at least one active material, having, adsorbed on their surface, an effective amount of a surface stabilizing agent comprising at least one anionic copolymer of dicarboxylic acid or a salt thereof.
- the invention relates, according to another of its aspects, to a dispersion comprising at least particles as defined above suspended in a liquid medium.
- the invention also relates, according to another of its aspects, to a composition, in particular cosmetic, dermatological or pharmaceutical, comprising at least particles or at least one dispersion of particles as defined above.
- Another subject of the invention is, according to another of its aspects, a process for the preparation of particles as defined above comprising at least:
- the invention further relates to a method of surface treatment of particles of at least one active material comprising bringing said particles into contact, in dispersion in a liquid medium, with at least an effective amount of a surfactant comprising at least at least an anionic copolymer of dicarboxylic acid or a salt thereof, under conditions suitable for the adsorption of said agent on the surface of said particles.
- anionic copolymers of dicarboxylic acid or their salts could be used effectively as a surface stabilizing agent and in particular to stabilize the particle size of an active material in dispersion in a liquid medium, to a dimension less than 1 ⁇ m and in particular to a nanometric dimension.
- the surface stabilizing agent according to the invention is fixed by adsorption to the surface of the particles of active material. More precisely, its molecules adhere to the particles of active material by physical interaction with them and not by chemical covalent bond (s) with the active material per se. Furthermore, the adsorbed molecules of the surfactant have no intermolecular bond established between them. In other words, they are uncrosslinked.
- this surface stabilizing agent may be present over the entire surface of the particles or distributed in an inhomogeneous manner over this surface and in particular present only on a part of it.
- the stabilizing agent comprises at least one anionic copolymer of dicarboxylic acid or one of its salts.
- this copolymer is derived from the copolymerization of at least one alkylene type monomer, linear or branched, with at least one dicarboxylic acid type monomer, in particular C 2 to C 8 , in particular C 2 to C 6 and more particularly in C 4 , of one of its salts or of its anhydrous derivative.
- the associated monomer it is more particularly a C 2 to C 10 , in particular C 2 to C 8 , and more particularly C 2 to C 6 , alkylene monomer, linear or branched.
- the anionic copolymer according to the invention may in particular have a molecular weight varying from 1,000 to 100,000, more particularly from 1,500 to 50,000 and in particular from 2,000 to 30,000.
- It can also be in the form of one of its alkaline or alkaline-earth salts, and in particular its sodium or potassium salt.
- an anionic copolymer according to the invention mention may more particularly be mentioned the copolymers of maleic anhydride and diisobutylene and salts thereof and more particularly the product marketed under the name Orotan 731DP ® by the company Rhodia.
- this dicarboxylic acid copolymer is combined with at least one nonionic (co) polymer.
- PNP polyvinyl pyrrolidones
- POE polyoxyethylenes
- the nonionic (co) polymer considered in the context of the present invention is a low molecular weight polyvinylpyrrolidone, in particular varying from 100 to 50,000, more particularly from 1,000 to 18,000 and in particular from 2,000 to 10 000.
- polyvinylpyrrolidone K1 7 of molecular weight 2500 sold by the company BASF.
- the dicarboxylic acid copolymer according to the invention is combined with at least one nonionic (co) polymer, in particular of the polyvinylpyrrolidone type, these two compounds can be brought into contact in a weight ratio varying from 1/99 to 99 / 1 and in particular from 25/75 to 75/25.
- the surface stabilizing agent is present on the surface of the particles in a so-called effective amount.
- this effective amount of surface stabilizing agent is at least equal to the minimum amount necessary to guarantee stability over time and / or in temperature of the size of the particles at the surface of which it is adsorbed. This stability is reflected in particular by an inertia of the particles dispersed in a liquid medium, vis-à-vis the phenomena of ripening and / or agglomeration, liable to occur over time.
- This stability over time can in particular be verified after storage of a dispersion of said particles in a liquid medium, in particular water, for at least one month at 4 ° C., one month at ambient temperature and / or one month at 45 ° C.
- This effective amount can depend on many parameters such as the nature of the active ingredient considered, its melting point and / or the solubility of the surface stabilizing agent considered in the liquid dispersion medium.
- the particles in accordance with the invention may comprise from 1 to 200% by weight, in particular from 1 to 100%, or even from 1.5 to 75%, and in particular from 2.5 to 25% in weight of surface stabilizing agent, relative to the weight of active material composing said particles.
- the particles according to the invention have a so-called submicron size or dimension. Within the meaning of the present invention, it is intended to cover under this term a dimension of less than 1 micron and in particular a nanometric dimension.
- the particles may have an average particle size of less than 1000 nm, in particular less than or equal to 500 nm, in particular less than or equal to 400 nm, more particularly from 150 to 350 nm measured by quasi-elastic light scattering or by light diffraction.
- average particle size varying from 150 to 350 nm it is meant to specify that at least 50% in number of the particles, in particular at least 70% of the particles, more particularly at least 90% of the particles even at least 95% of the particles have a particle size varying from 150 nm to approximately 350 nm, estimated by a technique such as those mentioned above. This measurement can for example be performed using Mastersizer 2000 particle size analyzers from the company Malvern or BI90 Plus from the company Brookhaven. Active ingredient
- the active ingredient considered in the context of the present invention is more particularly an active ingredient known to be sparingly soluble in at least one liquid medium.
- solubility in a liquid dispersion medium is less than 15 mg / ml, in particular less than 10 mg / ml, or even less than 5 mg / ml.
- the liquid dispersion medium more particularly considered is water. However, it may also be aqueous solutions or physiologically acceptable solvents such as oil, for example
- paraffin isopropyl palmitate, cetaryl isononanoate, capric-caprylic triglyceride, cyclopentasiloxane, jojoba oil, octyl palmitate, propylene glycol, hexylene glycol, ethanol, Mygliol 812 ® , octyl dodecanol, Finsolv TN ® , Arlamol Z ® , sesam ® , light petroleum jelly oil, apricot oil, volatile silicones , and isocetyl palmitate or a mixture thereof.
- the solubility of an active ingredient in a solvent can be checked according to the following protocol: in a 30 ml bottle, 20 g of solvent, then 2 g of the active ingredient are added. The temperature of the sample is brought to 60 ° C, with magnetic stirring, for 1 h, then the sample is left for 12 h at room temperature (25 ° C) and atmospheric pressure. The non-solubilized particles having sedimented, the supernatant is taken up
- the particles of the invention are composed of at least one active material.
- the particles consist of: a single active material, where appropriate associated with excipients and / or impurities which may in particular result from its method of preparation.
- the active material is used in a pure form and in particular crystallized and / or amorphous.
- the particles according to the invention can comprise approximately from 99.9% to approximately 50% by weight, more particularly approximately 99% to 70% by weight, and in particular approximately from 95% to approximately 75% by weight, active material (s) relative to the total weight of said particles.
- active ingredients which can be formulated in the form of particles in accordance with the invention can be pharmaceutical active ingredients, in particular biological materials such as proteins and peptides, active ingredients useful in the field of diagnostics, and more particularly materials active ingredients useful in the cosmetic and / or dermatological field.
- the particles in accordance with the invention can be formulated as a dispersion in a liquid medium, in particular in a physiologically acceptable solvent such as, for example, those mentioned above and in particular in aqueous dispersion.
- This type of dispersion can comprise from 0.01 to 50% by weight, in particular from 0.1 to 30% by weight, in particular from 1 to 20% by weight, or even from 5 to 15% by weight of particles depending on the invention relative to the total weight of the dispersion.
- the present invention also relates to a process for the preparation of the claimed particles.
- this method implements at least one step of adjusting the particle size of the active material considered to a submicron dimension, and in particular nanometric, and a step of bringing the particles thus obtained into contact with a conformal surfactant.
- the invention under conditions conducive to the adsorption of an effective amount of said agent on the surface of said particles, and the recovery of said particles thus stabilized in size.
- the adjustment of the particle size to a submicron and in particular nanometric dimension is carried out in the presence of the surface stabilizing agent.
- the nanoparticles are brought into contact with this surface stabilizing agent, before adjusting their size.
- the adjustment of the particle size can in particular be carried out by a conventional deagglomeration or grinding process. More precisely, such a method can comprise at least the steps consisting in:
- a surfactant according to the invention that is to say comprising at least one dicarboxylic acid copolymer under conditions suitable for the adsorption thereof this on the surface of the particles, and
- the step of bringing all or part of the surfactant into contact with the particles can be carried out beforehand, or during the step relating to the size adjustment, that is to say say for example by introducing it when the active material is dispersed in a liquid medium or during grinding.
- the techniques that can be applied to reduce the particle size of the active material can be conventional wet grinding means.
- these means there may be mentioned ball mills, operating in batch (eg type Discontimill ®) or continuous (eg Dynomill ® type the IMPANDEX company) or colloid mills or wheel , like those marketed by the company KORUMA. It is particularly advantageous to use ball mills insofar as they make it possible to control the time and the medium of grinding (size and nature of the balls) and can thus lead to greater fineness.
- the present invention further relates to a method of surface treatment of particles of at least one active material in particular for stabilizing the size of these particles at an average particle size less than or equal to 500 nm and more particularly less than or equal to 400 nm , comprising the treatment of said particles in dispersion in a liquid medium with a surfactant according to the invention,
- compositions comprising at least particles or a dispersion in accordance with the invention.
- These compositions can be cosmetic, dermatological and / or pharmaceutical depending on the nature of the active ingredients considered.
- cosmetic and / or dermatological compositions are more particularly considered in the context of the present invention cosmetic and / or dermatological compositions.
- compositions can contain variable amounts of particles
- ⁇ 5 according to the invention. They can be formulated in different aspects, in particular liquid of gel or emulsion type, solid or pasty, depending on the mode of administration envisaged.
- the particles in accordance with the present invention can be associated therewith with other active materials and / or excipients usually considered in this type of composition. It can in particular be liquid or solid fatty substances, surfactants,
- the cosmetic compositions are in dosage forms which are more particularly suitable for topical application.
- It can in particular be aqueous or oily dispersions of oily or aqueous gels, oil-in-water, water-in-oil, wax-in-water or water-in-wax emulsions and / or multiple emulsions .
- the cosmetic compositions according to the invention can in particular be in the form of cast products more particularly of sticks and more particularly of lipsticks or lip care products, they can also be in the form of a blush , a foundation, a mascara, a nail varnish, a product for caring for and / or making up the skin, in particular the body or the hair.
- Another subject of the invention is the use of at least one anionic copolymer of a dicarboxylic acid, where appropriate in combination with at least one nonionic (co) polymer as defined above, as an agent. surface stabilizer.
- anionic copolymer of a dicarboxylic acid where appropriate in combination with at least one nonionic (co) polymer as defined above, as an agent. surface stabilizer.
- Figures 1 - Distribution of the average particle size of ellagic acid particles without adsorption of stabilizing agent on their surface ( Figure 1 A),
- nanoparticles described in the examples below were prepared by the wet grinding technique according to the following protocol:
- the insoluble active material considered is introduced in the form of a coarse pre-dispersion of the active particles in their commercially available form in a solution comprising the retained surface stabilizing agent.
- This preparation is then treated in a NETZSCH ML IZETA ® ball mill (ZrO 2 yttria beads 0.6-0.8 mm), in continuous circulation for a period sufficient to obtain the expected nanoparticle size.
- the average particle sizes of the nanoparticles thus obtained are measured on Malvern Mastersizer ® .
- the mixture introduced into the mill has the following composition:
- the particles of the aqueous dispersion obtained after 60 minutes of reaction have: a D0.5 nb equal to 166 nm, a D0.9 nb equal to 239 nm, and a low polydispersity.
- D0.5 nb 166 nm, it is meant that 50% of the particles have a size .5 less than 166 nm,
- D0.9 nb 239 nm, it is meant that 90% of the particles have a size less than 239 nm.
- FIGS. 1A and IB respectively represent the particle size distribution by volume of the particles of ellagic acid before treatment (FIG. 1A) and after treatment (FIG.
- An aqueous dispersion of ellagic acid nanoparticles obtained without a dispersing surfactant according to the invention proves to be unstable under the same conditions and there is a strong state of aggregation, visible to the naked eye.
- Aqueous dispersions of nanoparticles are prepared in an amount of 10% by weight of DHEA with the method described above.
- S0 Table I below reports the tests carried out and the results obtained.
- the aqueous dispersions are prepared in an amount of 10% by weight of Keto-DHEA with the method described above.
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- Health & Medical Sciences (AREA)
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- Engineering & Computer Science (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Public Health (AREA)
- General Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Pharmacology & Pharmacy (AREA)
- Epidemiology (AREA)
- Animal Behavior & Ethology (AREA)
- Biomedical Technology (AREA)
- Optics & Photonics (AREA)
- Nanotechnology (AREA)
- Physics & Mathematics (AREA)
- Cosmetics (AREA)
- Fats And Perfumes (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
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Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006508337A JP2006526007A (ja) | 2003-05-20 | 2004-05-14 | 二酸コポリマーで寸法安定化された粒子 |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR03/06039 | 2003-05-20 | ||
| FR0306039A FR2855051B1 (fr) | 2003-05-20 | 2003-05-20 | Particules stabilisees en taille par copolymere diacide |
| US47922103P | 2003-06-18 | 2003-06-18 | |
| US60/479,221 | 2003-06-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2004103345A2 true WO2004103345A2 (fr) | 2004-12-02 |
| WO2004103345A3 WO2004103345A3 (fr) | 2005-02-17 |
Family
ID=33477721
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FR2004/001191 Ceased WO2004103345A2 (fr) | 2003-05-20 | 2004-05-14 | Particules stabilisees en taille par copolymere diacide |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2006526007A (fr) |
| KR (1) | KR20060006086A (fr) |
| WO (1) | WO2004103345A2 (fr) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5428058B2 (ja) * | 2007-12-28 | 2014-02-26 | ライオン株式会社 | 微粒化エラグ酸化合物の製造方法 |
| JP5611089B2 (ja) * | 2011-03-11 | 2014-10-22 | 花王株式会社 | 水性液体口腔用組成物 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5145684A (en) * | 1991-01-25 | 1992-09-08 | Sterling Drug Inc. | Surface modified drug nanoparticles |
| ATE419835T1 (de) * | 2002-05-06 | 2009-01-15 | Elan Pharma Int Ltd | Nystatin-nanopartikelzusammensetzungen |
-
2004
- 2004-05-14 KR KR1020057021734A patent/KR20060006086A/ko not_active Ceased
- 2004-05-14 WO PCT/FR2004/001191 patent/WO2004103345A2/fr not_active Ceased
- 2004-05-14 JP JP2006508337A patent/JP2006526007A/ja not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| WO2004103345A3 (fr) | 2005-02-17 |
| KR20060006086A (ko) | 2006-01-18 |
| JP2006526007A (ja) | 2006-11-16 |
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