Granted Patent
Utility
US 5,236,993 · App. 07/945,453
Process of crosslinking PVP
Inventors:
Robert B. Login, Jenn S. Shih, Jui-Chang Chuang
Patented Case
View Patent ↗
Granted: Aug 17, 1993
Filed: Sep 16, 1992
Inventors
Robert B. Login
Jenn S. Shih
Jui-Chang Chuang
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.