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. 21, 1984
Filed:
Oct. 08, 1981
Brian J Tighe, Birmingham, GB;
Howard J Gee, Derbyshire, GB;
Kelvin Lenses Limited, Manchester, GB;
Abstract
Polymeric materials suitable for biomedical applications, particularly in making contact lenses, are formed by copolymerization and crosslinking of: (1) an amide of an unsaturated carboxylic acid such as acrylamide or methacrylamide; (2) an N-vinyl lactam such as N-vinyl pyrrolidone; (3) an ester of an unsaturated carboxylic acid such as a hydroxy-substituted ester of acrylic or methacrylic acid; (4) an unsaturated carboxylic acid such as acrylic or methacrylic acid; and (5) a hydrophobic monomer component comprising: (a) a fluorine-containing polymerizable monomer having a fluoroaliphatic side chain, such as fluoroalkyl acrylate or methacrylate, and (b) a non-fluorine-containing polymerizable hydrophobic vinyl monomer such as styrene; crosslinking with a crosslinking agent either being carried out during copolymerization or subsequently. The resulting polymeric materials may be machined to produce a contact lens form and then hydrated to form a hydrogel which is suitable for use as an extended wear contact lens.