Granted Patent
Utility
US 5,298,662 · App. 07/539,286
Phenylenediamines as high temperature heat stabilizers
Inventors:
Bernard C. Smith, Jr., Mark Richardson
Patented Case
View Patent ↗
Granted: Mar 29, 1994
Filed: Jun 18, 1990
Inventors
Bernard C. Smith, Jr.
Mark Richardson
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.