Granted Patent
Utility
US 4,921,969 · App. 07/284,883
Method for the preparation of imidazoles
Inventors:
Wei-Yang Su, George P. Speranza
Patented Case
View Patent ↗
Granted: May 1, 1990
Filed: Dec 15, 1988
Inventors
Wei-Yang Su
George P. Speranza
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.