Granted Patent
Utility
US 5,885,152 · App. 08/062,692
Automotive ventilation housing with self supporting film valve having a convex semi-cylindrical shape
Inventor:
Kenneth Lawrence Wardlaw
Patented Case
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Granted: Mar 23, 1999
Filed: Apr 20, 1998
Inventor
Kenneth Lawrence Wardlaw
Assignee (at issue)
General Motors LLC
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.