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. 04, 1994
Filed:
Jan. 29, 1993
Applicant:
Inventors:
Assignee:
Asahi Kogaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02C / ; G02B / ;
U.S. Cl.
CPC ...
351159 ; 351167 ; 359708 ;
Abstract
In an aspherical spectacle lens having a negative degree and an aspherical surface of rotational symmetry located on an object side, a surface power of the aspherical surface of rotational symmetry at a center portion located on an axis of rotational symmetry is substantially 0 diopter, and the aspherical surface of rotational symmetry is of an apparent convex shape.