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:
Dec. 14, 1993
Filed:
Jun. 12, 1991
Applicant:
Inventors:
Assignee:
Seiko Epson Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02C / ; G02C / ;
U.S. Cl.
CPC ...
351176 ; 351168 ; 351169 ;
Abstract
A lens for eyeglasses which corrects an astigmatism includes a first refracting surface and a second refracting surface. Each refracting surface has an optical center and a periphery. At least one of the refracting surfaces is divided into a first portion and a second portion in which the first portion has a variation in curvature of the lens which is greater than the variation of curvature of the second portion.