Granted Patent
Utility
US 4,938,056 · App. 07/358,757
Determining the air permeability of a tire
Inventors:
James L. DeRudder, Kenneth M. Schur, John Porter
Patented Case
View Patent ↗
Granted: Jul 3, 1990
Filed: May 30, 1989
Inventors
James L. DeRudder
Kenneth M. Schur
John Porter
Assignee (at issue)
The Uniroyal Goodrich Tire 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.