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:
Apr. 03, 2012
Filed:
Aug. 09, 2006
Applicants:
Tadashi Kaga, Minowa-machi, JP;
Toshihide Shinohara, Chino, JP;
Inventors:
Tadashi Kaga, Minowa-machi, JP;
Toshihide Shinohara, Chino, JP;
Assignee:
Seiko Epson Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02C 7/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
An eye-side refractive surfaceof a distance portion is concave and at least part of an eye-side refractive surfaceof a near portion is a convex regionwhere one or both of principal meridians of the surface are convex. This provides a back surface progressive-power lens capable of solving disadvantages in terms of lens thickness, external appearance and the like in a back surface progressive-power lens in which the eye-side refractive surface is formed of a progressive-power surface.