Granted Patent
Utility
US 4,311,497 · App. 06/094,431
Method and apparatus for heat pump system protection
Inventor:
Dennis E. Newell
Patented Case
View Patent ↗
Granted: Jan 19, 1982
Filed: Nov 15, 1979
Inventor
Dennis E. Newell
Assignee (at issue)
ROBERTSHAW CONTROLS PRIVATE LIMITED
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.