Granted Patent
Utility
US 4,801,749 · App. 07/084,536
Phenolic antioxidant hydrazides
Inventors:
Robert T. Kazmierczak, Ronald E. MacLeay, Jerome Wicher
Patented Case
View Patent ↗
Granted: Jan 31, 1989
Filed: Aug 12, 1987
Inventors
Robert T. Kazmierczak
Ronald E. MacLeay
Jerome Wicher
Assignee (at issue)
Pennwalt Corporation
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.