Granted Patent
Utility
US 4,891,144 · App. 07/230,733
Polymers and lubricant additives of alkylene dithiothiadiazoles and alkylene cyanodithioimidocarbonates
Inventor:
Sameeh S. Toukan
Patented Case
View Patent ↗
Granted: Jan 2, 1990
Filed: Aug 10, 1988
Inventor
Sameeh S. Toukan
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.