Granted Patent
Utility
US 5,654,385 · App. 08/648,789
One-step process for making lightly-crosslinked polyvinylpyrrolidone hydrogel
Inventors:
Susan Y. Tseng, Philip F. Wolf, Thomas E. Royster
Patented Case
View Patent ↗
Granted: Aug 5, 1997
Filed: May 16, 1996
Inventors
Susan Y. Tseng
Philip F. Wolf
Thomas E. Royster
Assignee (at issue)
ISP INVESTMENTS LLC
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.