Granted Patent
Utility
US 5,268,439 · App. 07/636,961
Tin containing elastomers and products having reduced hysteresis properties
Inventors:
William L. Hergenrother, Tristram W. Bethea, John M. Doshak
Patented Case
View Patent ↗
Granted: Dec 7, 1993
Filed: Jan 2, 1991
Inventors
William L. Hergenrother
Tristram W. Bethea
John M. Doshak
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.