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. 12, 1989
Filed:
Feb. 16, 1989
Applicant:
Inventors:
James A Braatz, Rockville, MD (US);
Clifton L Kehr, Silver Spring, MD (US);
Assignee:
W. R. Grace & Co.-Conn., New York, NY (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528 59 ; 528 60 ; 528 66 ; 528 77 ; 528 85 ; 528904 ; 523106 ; 3511 / ;
Abstract
Hydrophilic polymeric soft contact lenses which are characterized by their biocompatibility and resistance to nonspecific protein adsorption. At least 75%, preferably at least 80%, of the prepolymers from which the lenses are prepared are isocyanate-capped oxyethylene-based diols or polyols having molecular weight of about 7000-30,000. Essentially all of the hydroxyl groups of the diols or polyols are capped with polyisocyanate prior to formation of the hydrated polymer of which the contact lenses are made.