The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 16, 1993
Filed:
Feb. 19, 1991
Applicant:
Inventor:
David P Spector, Sausalito, CA (US);
Assignee:
Pilkington Visioncare, Inc. (a CA. corp.), Menlo Park, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02C / ;
U.S. Cl.
CPC ...
351159 ; 351166 ; 351177 ;
Abstract
A series of back wafers for a laminated ophthalmic lens, wherein successive members of the series have a diopter difference in their concave curvature which is sufficiently small to enable a member of the series to be used in combination with any design and power of front wafer to produce a finished lens within the normal tolerance for such a lens. Preferably the diopter difference is 1/8 of a diopter. The invention also comprises a method of producing a laminated lens from the wafers. The series of back wafers enables the production of a finished lens within the normal tolerances for such lenses.