FR560363A - Process for the production of bifocal lenses - Google Patents

Process for the production of bifocal lenses

Info

Publication number
FR560363A
FR560363A FR560363DA FR560363A FR 560363 A FR560363 A FR 560363A FR 560363D A FR560363D A FR 560363DA FR 560363 A FR560363 A FR 560363A
Authority
FR
France
Prior art keywords
production
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
French (fr)
Inventor
Harry Fennell
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 FR560363A publication Critical patent/FR560363A/en
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)
FR560363D 1922-12-26 1922-12-26 Process for the production of bifocal lenses Expired FR560363A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR560363T 1922-12-26

Publications (1)

Publication Number Publication Date
FR560363A true FR560363A (en) 1923-10-03

Family

ID=8942884

Family Applications (1)

Application Number Title Priority Date Filing Date
FR560363D Expired FR560363A (en) 1922-12-26 1922-12-26 Process for the production of bifocal lenses

Country Status (1)

Country Link
FR (1) FR560363A (en)

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