Granted Patent
Utility
US 4,925,894 · App. 06/829,684
Elastomer compositions for tire treads having low rolling resistance and good wet and dry grip traction
Inventor:
Shingo Futamura
Patented Case
View Patent ↗
Granted: May 15, 1990
Filed: Feb 14, 1986
Inventor
Shingo Futamura
Assignee (at issue)
Bridgestone Firestone
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.