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. 29, 1992
Filed:
Aug. 31, 1990
Applicant:
Inventors:
Assignee:
Ciba-Geigy Corporation, Ardsley, NY (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B29D / ;
U.S. Cl.
CPC ...
264-26 ; 523106 ; 264-11 ; 264-14 ;
Abstract
A dimensionally stable hydrogel contact lens of polyvinyl alcohol having an equilibrium water content of between about 70 to about 80 weight percent, based upon the total swollen lens weight, said lens having been annealed in a mold essentially conforming to the contact lens dimensions under substantially ambient non-drying setting conditions in the presence of an aqueous-organic annealing promoter solvent, for a period of time substantially sufficient to reach annealing equilibrium.
Quick Actions:
Janssen, Robert. (1992). Preparation of stable polyvinyl alcohol hydrogel contact lens (U.S. Patent No. 5174929). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5174929
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile