Granted Patent
Utility
US 4,899,013 · App. 07/260,253
Viscous polymers of isobutylene and dienes
Inventor:
Kelley R. Lane
Patented Case
View Patent ↗
Granted: Feb 6, 1990
Filed: Oct 20, 1988
Inventor
Kelley R. Lane
Assignee (at issue)
Amoco 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.