Granted Patent
Utility
US 6,199,837 · App. 09/071,421
Thermoplastic elastomer air spring
Inventors:
Daniel J. Leonard, Keith E. Hoffman, Joseph L. Tazewell
Patented Case
View Patent ↗
Granted: Mar 13, 2001
Filed: May 1, 1998
Inventors
Daniel J. Leonard
Keith E. Hoffman
Joseph L. Tazewell
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.