Granted Patent
Utility
US 4,528,822 · App. 06/648,230
Heat pump refrigeration circuit with liquid heating capability
Inventor:
Paul R. Glamm
Patented Case
View Patent ↗
Granted: Jul 16, 1985
Filed: Sep 7, 1984
Inventor
Paul R. Glamm
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.