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. 10, 1978
Filed:
Oct. 19, 1976
Applicant:
Inventor:
Bernard Mignen, Saint-Maur, FR;
Assignee:
Essilor International, Cie Generale d'Optique, Joinville-le-Pont, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29D / ;
U.S. Cl.
CPC ...
29424 ; 295271 ; 29559 ; 5121 / ; 264-1 ; 351169 ;
Abstract
The invention relates generally to the production of ophthalmic lenses having, on one face, an active zone of progressively variable radius of curvature. According to the invention, when the blank from which such a lens is obtained is being cast, there is formed, on the periphery of its active zone, an edge region or facet extending continuously and circularly right round the said active zone for the subsequent support of the mould which is used to enable a gripper block to be cast on the face of the blank so as to enable a second machining operation to be carried out on the opposite face of the blank.