Granted Patent
Utility
US 4,080,314 · App. 05/666,086
Polyurethane elastomers based on alcohol-modified diisocyanate
Inventors:
Henry W. Bonk, Benjamin S. Ehrlich, Joseph Pleckaitis
Patented Case
View Patent ↗
Granted: Mar 21, 1978
Filed: Mar 11, 1976
Inventors
Henry W. Bonk
Benjamin S. Ehrlich
Joseph Pleckaitis
Assignee (at issue)
The Upjohn Co.
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.