Granted Patent
Utility
US 5,502,533 · App. 08/468,526
Filter for photothermographic developer
Inventor:
Robert M. Biegler
Patented Case
View Patent ↗
Granted: Mar 26, 1996
Filed: Jun 6, 1995
Inventor
Robert M. Biegler
Assignee (at issue)
Minnesota Mining and Manufacturing 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.