Granted Patent
Utility
US 5,789,488 · App. 08/670,053
Preparation of water soluble graft copolymers
Inventors:
Keith A. Bair, Elizabeth V. Bissinger, Ellen M. Meyer
Patented Case
View Patent ↗
Granted: Aug 4, 1998
Filed: Jun 25, 1996
Inventors
Keith A. Bair
Elizabeth V. Bissinger
Ellen M. Meyer
Assignee (at issue)
Betzdearborn, Inc.
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.