Granted Patent
Utility
US 4,869,968 · App. 07/205,968
Rubber article comprising contiguous portions of an isoprene rubber composition and a butadiene rubber composition containing a polymeric activator
Inventors:
Aubert Y. Coran, Leonard H. Davis
Patented Case
View Patent ↗
Granted: Sep 26, 1989
Filed: Jun 13, 1988
Inventors
Aubert Y. Coran
Leonard H. Davis
Assignee (at issue)
Monsanto Company
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.