Granted Patent
Utility
US 5,686,222 · App. 08/761,437
Dihydrazides
Inventors:
Mario Fryberg, Otto Gottel, Thomas Stauner
Patented Case
View Patent ↗
Granted: Nov 11, 1997
Filed: Dec 6, 1996
Inventors
Mario Fryberg
Otto Gottel
Thomas Stauner
Assignee (at issue)
Ilford AG
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.