Granted Patent
Utility
US 5,648,722 · App. 08/508,599
Apparatus and method for determining the state of an electrical switch within an HVAC system
Inventors:
Nir Merry, Jack Francis Hammons
Patented Case
View Patent ↗
Granted: Jul 15, 1997
Filed: Jul 28, 1995
Inventors
Nir Merry
Jack Francis Hammons
Assignee (at issue)
Gas Research Institute
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.