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:
Feb. 28, 1978
Filed:
Sep. 02, 1976
Hoya Lens Corporation, Tokyo, JA;
Abstract
The decrease in the impact resistance of the chemically pre-strengthened finished ophthalmic lens blanks due to the subsequent cutting and edging process can be prevented by coating the edge with at least one material selected from epoxy resins, alkyd resins, polyurethane resins, unsaturated polyester resins, acrylic resins or cyanoacrylates, polymerization of which can be completed by heating at a temperature of up to 200.degree. C, by single coating, overlap coating or multiple-layer coating, and then polymerizing the edge coating or coatings to form a polymeric film. Also, if a black pigment is added to any of the starting material compositions for said resins, internal reflections from the lens and the resulting myopic rings around the periphery of the lens can also be reduced.