US2158422A - Manufacture of sensitized photographic printing paper and cloth - Google Patents

Manufacture of sensitized photographic printing paper and cloth Download PDF

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Publication number
US2158422A
US2158422A US192891A US19289138A US2158422A US 2158422 A US2158422 A US 2158422A US 192891 A US192891 A US 192891A US 19289138 A US19289138 A US 19289138A US 2158422 A US2158422 A US 2158422A
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US
United States
Prior art keywords
cloth
paper
nitrite
manufacture
gms
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.)
Expired - Lifetime
Application number
US192891A
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English (en)
Inventor
Holden John
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
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Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US2158422A publication Critical patent/US2158422A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/64—Compositions containing iron compounds as photosensitive substances

Definitions

  • borax are dissolved in water and made called blue prints by the ferroprussiate process, u t a v 1 r 500 d t m 1 5 and has for its object to provide an improved g z 2 5 so paper in which a better contrast between the re a e 30 gms. potassium ferrocyanide.
  • white lines and the blue background is obta ned 25 0t 1 I Hi and which paper will also keep without deteriorap ass um e cya'm 10 on, for long periods 30 m -dpotazsium toxalatel dissolveidsom water 10
  • the present invention produces an improved 25 an a?
  • a suitable raw paper is coated on one side with According o s invention a 9 -1 cloth a light sensitive ferroprussiate or blue print for the making of blue-pr n is m by 8-1)- solutlon, according to Example I and dried, the 20 p y t0 the Surface One more Solutions In dry sensitive surface is then dusted over in any neutral or alkaline conditions, containing an iron convenient manner h as b means of a felt salt, an iron-cyanogen compound which may be pad with a dry powder of the following commsieither a ferri-cyanide, a ferro-cyanide, or both, i tion: buffer salts and a nitrite, in one solution, or the s 5 nitrite being applied in a separate solution.
  • the invention can be carried out in several nee starch powder ways as hereinafter exemplified, and the nitrite Excess of powder is removed by means of fa t used is a nitrite of a suitable metal or base, which rotating brushes in light cuntact with the D will act as an acid absorbing agent when called dered urfa
  • the powder adheres in and/or upon to do so; that is to say it has a quantitive on the surface in the form f a r layer not reaction with acids or acidic salts with which it easily removed by mechanical fri tion comes in contact before exposure to light and when exposed to light under a aesign the COIISfBQIIEIItIY will keep W Palm: 9 cmth in the prints are washed in water, development takes lequlled neutral alkalme condltmnplace in the usual manner but afterwards the It also will counteract the acid nature of some oxidising
  • the nitrite when in contact with acids or acidic f gg g flg g g i fi g g ig g mg zggggf salts has an oxidizing action which in some insmon. k stances may assist in the intensification of the print. 400 gms. ferric ammonium oxalate.
  • a chlorate may be used to provide a mild oxigins. borax. dizing action.
  • the coated or sensitive surface may be coated
  • the above are dissolved in water to volume with a developing or intensifying oxidizing agent or 1000 to which is added 5 in the form of a fine dry powder, such a powder 140 gms, potassium ferrocyanide.
  • the solution is preferably applied by mechanical means such as by contact with a roller re- 0 be necessary to make one or two tests to arrive at the most suitable quantity to make the best and most lasting prints.
  • Example IV A suitablepaper is coated in any convenient manner with a solution of:
  • nitrite and the chlorate may be in nonaqueous solutions and may be applied at any convenient stage. Care must be taken by the use of buffer salts, mild alkalis or other suitable means to prevent its, or their premature decomposition.
  • the chlorate stabilizes the blue background and the nitrite assists in the formation of clear white lines, and also helps to keep the paper in good condition before use.
  • Blue print paper suitable for producing prints by the semi-dry development process having on its surface a non-acid coating comprising a soluble iron salt, an iron-cyanogen compound, a buffer salty and a soluble nitrite.
  • Blue print" paper as defined in claim 1, in which the soluble iron salt is a ferric salt and the iron-cyanogen compound is a ferrocyanide.
  • the coating comprises a soluble chlorate.
  • Blue print paper as defined in claim 1, in which the nitrite is a nitrite of an alkali metal.
  • A'methodfor preparing blue print paper winch comprises applying to the paper a nonac'id' coating. solution containing a soluble iron salt, aniromcyanogen compound, a bufier salt and a soluble .nitriteydrying the coated paper, and applying an oxidizing developing agent in the form of a fine dry powder.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Coloring (AREA)
  • Color Printing (AREA)
US192891A 1937-02-27 1938-02-26 Manufacture of sensitized photographic printing paper and cloth Expired - Lifetime US2158422A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB205204X 1937-02-27

Publications (1)

Publication Number Publication Date
US2158422A true US2158422A (en) 1939-05-16

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ID=10147232

Family Applications (2)

Application Number Title Priority Date Filing Date
US21240D Expired USRE21240E (en) 1937-02-27 Manufacture of sensitized photo
US192891A Expired - Lifetime US2158422A (en) 1937-02-27 1938-02-26 Manufacture of sensitized photographic printing paper and cloth

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US21240D Expired USRE21240E (en) 1937-02-27 Manufacture of sensitized photo

Country Status (3)

Country Link
US (2) US2158422A (de)
CH (1) CH205204A (de)
GB (1) GB494572A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2978345A (en) * 1958-05-15 1961-04-04 Du Pont Stabilization of zinc ferricyanide
US3161510A (en) * 1961-10-26 1964-12-15 Western Electric Co Visual aid technique of presenting drawing changes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2978345A (en) * 1958-05-15 1961-04-04 Du Pont Stabilization of zinc ferricyanide
US3161510A (en) * 1961-10-26 1964-12-15 Western Electric Co Visual aid technique of presenting drawing changes

Also Published As

Publication number Publication date
USRE21240E (en) 1939-10-17
GB494572A (en) 1938-10-27
CH205204A (de) 1939-06-15

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