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:
Oct. 11, 2005
Filed:
Oct. 16, 2003
Applicants:
Hiroshi Sato, Kanagawa-ken, JP;
Chikara Yamamoto, Saitama-ken, JP;
Moriyasu Shirayanagi, Saitama-ken, JP;
Inventors:
Hiroshi Sato, Kanagawa-ken, JP;
Chikara Yamamoto, Saitama-ken, JP;
Moriyasu Shirayanagi, Saitama-ken, JP;
Assignee:
PENTAX Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02C007/06 ;
U.S. Cl.
CPC ...
Abstract
A progressive power lens belonging to a series of lenses according to the present invention is provided. If a first lens and a second lens randomly chosen from the series of progressive power lenses have a common spherical refractive power Sph [diopter] in the distance portions thereof, the Sph is greater than or equal to +1, and a base curve BCof the first lens is smaller than a base curve BCof the second lens, the first and second lenses satisfy a condition: