Granted Patent
Utility
US 4,871,874 · App. 07/062,161
Process for producing dienes
Inventor:
Joachim W. Wolfram
Patented Case
View Patent ↗
Granted: Oct 3, 1989
Filed: Jun 15, 1987
Inventor
Joachim W. Wolfram
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.