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:
Dec. 07, 1976
Filed:
Mar. 17, 1976
Edward A Travnicek, Southbridge, MA (US);
American Optical Corporation, Southbridge, MA (US);
Abstract
Reinforced silicone elastomers, having improved tensile strength and particularly tear strength, include at least copolymers of aryl siloxanes and alkyl siloxanes, in a ratio of aryl to alkyl substituents providing 6 to 16 mole percent phenyl chosen to provide a refractive index matched to the index of refraction of a silica filler, form optically clear material useful for soft contact lenses. Preferably two copolymers are used and each has methyl groups with 6 to 16 mole percent phenyl groups. One of the two copolymers contains terminal vinyl groups and the other copolymer contains terminal (R).sub.2 HSi--O-- groups. Platinum materials are used to catalyze the vulcanization of the copolymer mix. These elastomers are useful for a variety of optical products, e.g., contact lenses, intraocular implants and the like.