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:
Jan. 25, 2011
Filed:
Mar. 29, 2010
Toshihide Shinohara, Chino, JP;
Tadashi Kaga, Minowa-machi, JP;
Ayumu Ito, Minowa-machi, JP;
Moriyasu Shirayanagi, Tokyo, JP;
Toshihide Shinohara, Chino, JP;
Tadashi Kaga, Minowa-machi, JP;
Ayumu Ito, Minowa-machi, JP;
Moriyasu Shirayanagi, Tokyo, JP;
Seiko Epson Corporation, Tokyo, JP;
Seiko Optical Products Co., Ltd., Tokyo, JP;
Abstract
A progressive power lens that prevents degradation in optical characteristics invited by deviation of a pantoscopic angle from the standard value. The lens includes an outer refractive surface and an inner refractive surface, at least one of which is a progressive surface. Because the amount and direction of aberrations generated in distance and near portions are different, correction is given to either or both of the surface powers of the outer and inner surfaces of the lens such that the distance and near portions are differently corrected.