Granted Patent
Utility
US 4,319,046 · App. 05/946,284
Preparation of 1,2 diaminobenzene by high pressure acid hydrolysis of benzemidazolone
Inventor:
Lubomir Vacek
Patented Case
View Patent ↗
Granted: Mar 9, 1982
Filed: Sep 27, 1978
Inventor
Lubomir Vacek
Assignee (at issue)
The Sherwin-Williams Company
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.