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:
Jan. 02, 1990
Filed:
Mar. 15, 1984
Applicant:
Inventors:
Joseph W Wittmann, Rochester, NY (US);
John M Evans, Greece, NY (US);
Assignee:
CooperVision, Inc., San Jose, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D06P / ; C09B / ;
U.S. Cl.
CPC ...
8507 ; 8509 ; 8549 ;
Abstract
Hydrophilic contact lenses comprised of a copolymer of an hydroxyl group-containing monomer and N-vinylpyrrolidone are tinted by impregnating the lens with an aqueous solution of a dichlorotriazine reactive dye and fixing the dye in the lens by contacting the lens with an aqueous alkaline solution.