Granted Patent
Utility
US 4,489,568 · App. 06/599,601
Ground water heat pump system
Inventor:
Robert P. Shapess
Patented Case
View Patent ↗
Granted: Dec 25, 1984
Filed: Apr 13, 1984
Inventor
Robert P. Shapess
Assignee (at issue)
Snyder General 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.