Granted Patent
Utility
US 5,186,014 · App. 07/912,374
Low refrigerant charge detection system for a heat pump
Inventor:
Robert Michael Runk
Patented Case
View Patent ↗
Granted: Feb 16, 1993
Filed: Jul 13, 1992
Inventor
Robert Michael Runk
Assignee (at issue)
General Motors LLC
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.