FR841745A - Lentilles bifocales - Google Patents

Lentilles bifocales

Info

Publication number
FR841745A
FR841745A FR841745DA FR841745A FR 841745 A FR841745 A FR 841745A FR 841745D A FR841745D A FR 841745DA FR 841745 A FR841745 A FR 841745A
Authority
FR
France
Prior art keywords
bifocal lenses
bifocal
lenses
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
Application number
Other languages
English (en)
Inventor
David Slotsky
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 filed Critical
Application granted granted Critical
Publication of FR841745A publication Critical patent/FR841745A/fr
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/02—Lenses; Lens systems ; Methods of designing lenses
    • G02C7/06—Lenses; Lens systems ; Methods of designing lenses bifocal; multifocal ; progressive

Landscapes

  • Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
FR841745D 1938-08-04 1938-08-04 Lentilles bifocales Expired FR841745A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR841745T 1938-08-04

Publications (1)

Publication Number Publication Date
FR841745A true FR841745A (fr) 1939-05-25

Family

ID=9309629

Family Applications (1)

Application Number Title Priority Date Filing Date
FR841745D Expired FR841745A (fr) 1938-08-04 1938-08-04 Lentilles bifocales

Country Status (1)

Country Link
FR (1) FR841745A (fr)

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