Granted Patent
Utility
US 5,840,982 · App. 08/090,600
Process for preparing para-phenylenediamine derivatives
Inventors:
Michael P. Reynolds, Russell E. Malz, Jr.
Patented Case
View Patent ↗
Granted: Nov 24, 1998
Filed: Jun 4, 1998
Inventors
Michael P. Reynolds
Russell E. Malz, Jr.
Assignee (at issue)
Uniroyal Chemical Company, 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.