Granted Patent
Utility
US 4,694,048 · App. 06/854,274
Thermoplastic polymers containing repeating hydrazide groups
Inventor:
Eui W. Choe
Patented Case
View Patent ↗
Granted: Sep 15, 1987
Filed: Apr 21, 1986
Inventor
Eui W. Choe
Assignee (at issue)
Celanese GmbH
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.