GB1231402A - - Google Patents

Info

Publication number
GB1231402A
GB1231402A GB1231402DA GB1231402A GB 1231402 A GB1231402 A GB 1231402A GB 1231402D A GB1231402D A GB 1231402DA GB 1231402 A GB1231402 A GB 1231402A
Authority
GB
United Kingdom
Prior art keywords
elements
lenses
polymethylmethacrylate
complimentary
moulded
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)
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
Publication of GB1231402A publication Critical patent/GB1231402A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Eyeglasses (AREA)
GB1231402D 1967-09-11 1967-09-11 Expired GB1231402A (enrdf_load_stackoverflow)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4130167 1967-09-11

Publications (1)

Publication Number Publication Date
GB1231402A true GB1231402A (enrdf_load_stackoverflow) 1971-05-12

Family

ID=10419055

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1231402D Expired GB1231402A (enrdf_load_stackoverflow) 1967-09-11 1967-09-11

Country Status (2)

Country Link
FR (1) FR1581853A (enrdf_load_stackoverflow)
GB (1) GB1231402A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4070105A (en) * 1976-03-05 1978-01-24 Marzouk Youssef Marzouk Laminar fresnel reduced ophthalmic lens construction
US4146306A (en) * 1977-06-27 1979-03-27 Wallach David L Optical lens

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4070105A (en) * 1976-03-05 1978-01-24 Marzouk Youssef Marzouk Laminar fresnel reduced ophthalmic lens construction
US4146306A (en) * 1977-06-27 1979-03-27 Wallach David L Optical lens

Also Published As

Publication number Publication date
FR1581853A (enrdf_load_stackoverflow) 1969-09-19

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees