Granted Patent
Utility
US 4,931,528 · App. 07/348,824
1-isopropyl-2-methyl imidazole as an epoxy resin curative
Inventors:
Harold G. Waddill, George P. Speranza, Wei-Yang Su
Patented Case
View Patent ↗
Granted: Jun 5, 1990
Filed: May 8, 1989
Inventors
Harold G. Waddill
George P. Speranza
Wei-Yang Su
Assignee (at issue)
Texaco Chemical Inc.
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.