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:
Aug. 05, 1997
Filed:
May. 16, 1996
Applicant:
Inventors:
Susan Y Tseng, Staten Island, NY (US);
Philip F Wolf, Bridgewater, NJ (US);
Thomas E Royster, Piscataway, NJ (US);
Assignee:
ISP Investments Inc., Wilmington, DE (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08F / ; C08F / ;
U.S. Cl.
CPC ...
526264 ; 526 62 ; 526 53 ;
Abstract
A one-step for making a lightly-crosslinked polyvinylpyrrolidone hydrogel by polymerizing vinyl pyrrolidone in water in the presence of a suitable crosslinker such as 1-vinyl-3(E)-ethylidene pyrrolidone and a free radical initiator under initial agitation conditions sufficient to overcome the inertia of the polymer when formed.