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, 1977
Filed:
Mar. 04, 1976
Paul Feneberg, Planegg, DT;
AGFA-Gevaert AG, Leverkusen, DT;
Abstract
A concave die punch of the type required in the formation of silicone elastomer contact lenses in which the curvature of the marginal zone is greater than the curvature of the central zone is made by making a convex die negative from glass or a vitreous ceramic; providing the negative with a thin metal coating, and then forcing a concave die positive made of a heat hardenable plastic in an enclosed space against the metal coated surface of the die negative while heating the said resin to harden it, thereby causing the metal coating to adhere to the positive and thus transferring the metal coating to the die positive whereby a reproduction of the surface of the die negative on the die positive is obtained.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile