Granted Patent
Utility
US 5,729,474 · App. 08/353,536
Method of anticipating potential HVAC failure
Inventors:
Paul N. Hildebrand, W. John Light, T. Frank Knight, Kelley A. Lawrence
Patented Case
View Patent ↗
Granted: Mar 17, 1998
Filed: Dec 9, 1994
Inventors
Paul N. Hildebrand
W. John Light
T. Frank Knight
Kelley A. Lawrence
Assignee (at issue)
Excel Energy Technologies, 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.