Granted Patent
Utility
US 5,156,178 · App. 07/660,340
Vacuum-actuated vent assembly
Inventor:
Robert S. Harris
Patented Case
View Patent ↗
Granted: Oct 20, 1992
Filed: Feb 22, 1991
Inventor
Robert S. Harris
Assignee (at issue)
Stant Corporation
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.