Granted Patent
Utility
US 5,234,621 · App. 07/809,230
Rinse-free shampoo containing cross-linked carboxymethylcellulose
Inventors:
Benjamin Weinstein, Donald F. H. Wallach
Patented Case
View Patent ↗
Granted: Aug 10, 1993
Filed: Dec 17, 1991
Inventors
Benjamin Weinstein
Donald F. H. Wallach
Assignee (at issue)
Micro Vesicular Systems, 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.