Granted Patent
Utility
US 6,170,286 · App. 09/351,035
Oil return from refrigeration system evaporator using hot oil as motive force
Inventor:
Edward F. Keuper
Patented Case
View Patent ↗
Granted: Jan 9, 2001
Filed: Jul 9, 1999
Inventor
Edward F. Keuper
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.