Granted Patent
Utility
US 6,369,180 · App. 09/642,545
Process for making water soluble polyvinylcaprolactam polymers
Inventors:
Jenn S. Shih, Donald I. Prettypaul, John Mc Kittrick, David E. Graham
Patented Case
View Patent ↗
Granted: Apr 9, 2002
Filed: Aug 18, 2000
Inventors
Jenn S. Shih
Donald I. Prettypaul
John Mc Kittrick
David E. Graham
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.