Granted Patent
Utility
US 6,205,808 · App. 09/390,103
Prevention of oil backflow from a screw compressor in a refrigeration chiller
Inventor:
Dennis M. Beekman
Patented Case
View Patent ↗
Granted: Mar 27, 2001
Filed: Sep 3, 1999
Inventor
Dennis M. Beekman
Assignee (at issue)
American Standard Inc.
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.