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. 17, 1985
Filed:
Jul. 23, 1984
Applicant:
Inventor:
Ping I Lee, Valley Cottage, NY (US);
Assignee:
Ciba Geigy Corporation, Ardsley, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29D / ;
U.S. Cl.
CPC ...
264-21 ; 264-26 ; 3511 / ; 525 61 ;
Abstract
Soft contact lenses of polyvinyl alcohol having a weight average molecular weight of at least about 6,000, crosslinked with borate in an effective amount, to increase the elastic modulus thereof, said lenses being substantially insoluble in the ocular tear fluid environment, and methods for their preparation are disclosed. These materials are characterized by their high water content, high dissolved oxygen permeability, high optical clarity and especially their superior mechanical strength.