Granted Patent
Utility
US 4,638,233 · App. 06/791,026
Method of establishing a preferred rate of air flow, method of determining torque, and apparatus
Inventor:
David M. Erdman
Patented Case
View Patent ↗
Granted: Jan 20, 1987
Filed: Oct 24, 1985
Inventor
David M. Erdman
Assignee (at issue)
General Electric Company
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.