Granted Patent
Utility
US 5,156,837 · App. 07/582,290
Cosmetic compositions containing quaternized nitrogen compounds
Inventors:
Ratan K. Chaudhuri, David J. Tracy, Robert B. Login
Patented Case
View Patent ↗
Granted: Oct 20, 1992
Filed: Sep 14, 1990
Inventors
Ratan K. Chaudhuri
David J. Tracy
Robert B. Login
Assignee (at issue)
ISP INVESTMENTS LLC
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.