Granted Patent
Utility
US 4,971,104 · App. 07/486,368
Self powered servo actuated backpressure regulating valve
Inventor:
Kent Weber
Patented Case
View Patent ↗
Granted: Nov 20, 1990
Filed: Feb 28, 1990
Inventor
Kent Weber
Assignee (at issue)
Sundstrand 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.