Granted Patent
Utility
US 5,237,015 · App. 07/787,507
Core-shell polymer for use in tire treads
Inventor:
Paul Carl Urban
Patented Case
View Patent ↗
Granted: Aug 17, 1993
Filed: Nov 4, 1991
Inventor
Paul Carl Urban
Assignee (at issue)
Polysar Rubber 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.