Granted Patent
Utility
US 6,029,447 · App. 08/922,840
Spring brake actuator with filtered vent openings
Inventors:
Steven M. Stojic, Daniel Greenzweig
Patented Case
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Granted: Feb 29, 2000
Filed: Aug 26, 1997
Inventors
Steven M. Stojic
Daniel Greenzweig
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.