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:
Mar. 05, 2002
Filed:
Jan. 14, 2000
Kikuo Mitomo, Tokyo, JP;
Tohru Shirafuji, Tokyo, JP;
Hideo Suda, Tokyo, JP;
Teruhisa Shimizu, Tokyo, JP;
Yuichi Yokoyama, Tokyo, JP;
Hoya Healthcare Corporation, Tokyo, JP;
Abstract
Gas-permeable hard contact lenses are produced by hot press-stretching a crosslined gas-permeable hard contact lens material and then machining the press-stretched material. The gas-permeable hard contact lenses are formed from a crosslinked gas permeable hard contact lens material which is hot press-stretched to have a compression ration of 5 to 50% and a compression-flexure fracture strength of 300 to 1,500 g. Efficiently produced gas-permeable hard contact lenses are produced which are free of optical strains, excellent in transparency, small internal stress and comfortable to wear with improved durability strength.