Granted Patent
Utility
US 5,355,673 · App. 07/985,642
Exhaust valve
Inventors:
Robert E. Sterling, Mathew R. Sterling
Patented Case
View Patent ↗
Granted: Oct 18, 1994
Filed: Nov 18, 1992
Inventors
Robert E. Sterling
Mathew R. Sterling
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.