Granted Patent
Utility
US 4,604,484 · App. 06/403,289
Monoalkylation of 1-alkyl-diaminobenzenes
Inventor:
Kryn G. Ihrman
Patented Case
View Patent ↗
Granted: Aug 5, 1986
Filed: Jul 30, 1982
Inventor
Kryn G. Ihrman
Assignee (at issue)
Ethyl Corporation
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.