Granted Patent
Utility
US 5,387,675 · App. 08/029,208
Modified hydrophobic cationic thickening compositions
Inventor:
Michael Yeh
Patented Case
View Patent ↗
Granted: Feb 7, 1995
Filed: Mar 10, 1993
Inventor
Michael Yeh
Assignee (at issue)
Rhone-Poulenc Specialty Chemicals Co.
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.