Granted Patent
Utility
US 4,859,778 · App. 07/169,258
Process for the preparation of 2,2'-dithiobis (benzothiazole)
Inventors:
Edward L. Graeber, Michael J. Lindstrom
Patented Case
View Patent ↗
Granted: Aug 22, 1989
Filed: Mar 17, 1988
Inventors
Edward L. Graeber
Michael J. Lindstrom
Assignee (at issue)
Pennwalt 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.