GB204973A - Process of making bifocal lenses - Google Patents

Process of making bifocal lenses

Info

Publication number
GB204973A
GB204973A GB3381522A GB3381522A GB204973A GB 204973 A GB204973 A GB 204973A GB 3381522 A GB3381522 A GB 3381522A GB 3381522 A GB3381522 A GB 3381522A GB 204973 A GB204973 A GB 204973A
Authority
GB
United Kingdom
Prior art keywords
bifocal lenses
glass
lenses
discs
making bifocal
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
GB3381522A
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
Original Assignee
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
Priority to GB3381522A priority Critical patent/GB204973A/en
Publication of GB204973A publication Critical patent/GB204973A/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)
  • Laser Beam Processing (AREA)

Abstract

204,973. Fennell, H. Dec. 11, 1922. Forming lenses.-Bifocal lenses are made by fusing into a recess 2 in a block of glass 1 a button composed of superposed integral discs 4, 5 or laminµ of glass of different indices of refraction. The discs may be fused together either before or after convex surfaces have been formed on them.
GB3381522A 1922-12-11 1922-12-11 Process of making bifocal lenses Expired GB204973A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3381522A GB204973A (en) 1922-12-11 1922-12-11 Process of making bifocal lenses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3381522A GB204973A (en) 1922-12-11 1922-12-11 Process of making bifocal lenses

Publications (1)

Publication Number Publication Date
GB204973A true GB204973A (en) 1923-10-11

Family

ID=10357812

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3381522A Expired GB204973A (en) 1922-12-11 1922-12-11 Process of making bifocal lenses

Country Status (1)

Country Link
GB (1) GB204973A (en)

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