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:
Aug. 08, 1989
Filed:
Oct. 08, 1986
Applicant:
Inventors:
Maurice Dufour, Paris, FR;
Gerard Obrecht, Issy Les Moulineaux, FR;
Assignee:
Essilor International Compagnie Generale d'Optique, Creteil, FR;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02C / ;
U.S. Cl.
CPC ...
351169 ; 351168 ;
Abstract
A progressive ophthalmic lens with a continuous progressive surface comprises a substantially constant power first area matched to far vision. It also has a substantially constant power second area matched to near vision. Between the first and second areas is a progressively varying power third area. This is defined by a central part extending to both sides of the main progression meridian. In this central area each line on the progressive surface parallel to the main progression meridian substantially satisfies at every point the following equation: