Granted Patent
Utility
US 4,406,594 · App. 06/269,304
Compressor oil pump
Inventors:
Stephen A. Smaby, Arthur L. Butterworth
Patented Case
View Patent ↗
Granted: Sep 27, 1983
Filed: Jun 1, 1981
Inventors
Stephen A. Smaby
Arthur L. Butterworth
Assignee (at issue)
The Trane 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.