Granted Patent
Utility
US 3,993,645 · App. 05/573,166
Stilbene optical brighteners and compositions brightened therewith
Inventors:
Nathan N. Crounse, Kantilal B. Desai
Patented Case
View Patent ↗
Granted: Nov 23, 1976
Filed: Apr 30, 1975
Inventors
Nathan N. Crounse
Kantilal B. Desai
Assignee (at issue)
Sterling Drug, 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.