Granted Patent
Utility
US 4,985,487 · App. 07/463,710
Zwitterion polymers
Inventors:
Jenn S. Shih, Terry E. Smith
Patented Case
View Patent ↗
Granted: Jan 15, 1991
Filed: Jan 11, 1990
Inventors
Jenn S. Shih
Terry E. Smith
Assignee (at issue)
GAF Chemicals Corporation
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.