Granted Patent
Utility
US 4,975,220 · App. 07/433,808
Polyamide-polyester fluorescent pigments
Inventors:
Steven G. Streitel, George F. Rueter
Patented Case
View Patent ↗
Granted: Dec 4, 1990
Filed: Nov 9, 1989
Inventors
Steven G. Streitel
George F. Rueter
Assignee (at issue)
Nalco Chemical Company
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.