Granted Patent
Utility
US 4,851,490 · App. 07/313,692
Water soluble phosphonated polymers
Inventors:
Fu Chen, Keith A. Bair
Patented Case
View Patent ↗
Granted: Jul 25, 1989
Filed: Feb 21, 1989
Inventors
Fu Chen
Keith A. Bair
Assignee (at issue)
Betz Laboratories, 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.