Granted Patent
Utility
US 5,210,304 · App. 07/667,221
Process for preparing hydrocarbyl aromatic amines
Inventors:
John F. Balhoff, Donald E. Balhoff
Patented Case
View Patent ↗
Granted: May 11, 1993
Filed: Mar 11, 1991
Inventors
John F. Balhoff
Donald E. Balhoff
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.