Granted Patent
Utility
US 5,874,495 · App. 08/487,755
Polymers useful as PH responsive thickeners and monomers therefor
Inventor:
Fred Robinson
Patented Case
View Patent ↗
Granted: Feb 23, 1999
Filed: Jun 7, 1995
Inventor
Fred Robinson
Assignee (at issue)
Rhodia, 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.