Granted Patent
Utility
US 5,552,462 · App. 08/156,189
Compositions including cationic polymers and anionic xanthan gum
Inventor:
Michael Yeh
Patented Case
View Patent ↗
Granted: Sep 3, 1996
Filed: Nov 22, 1993
Inventor
Michael Yeh
Assignee (at issue)
Rhone-Poulenc, 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.