Granted Patent
Utility
US 4,475,876 · App. 06/453,517
Oil purge system for cold weather shutdown of oil flooded screw compressor
Inventor:
Donald S. Olen
Patented Case
View Patent ↗
Granted: Oct 9, 1984
Filed: Dec 27, 1982
Inventor
Donald S. Olen
Assignee (at issue)
Allis-Chalmers 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.