Granted Patent
Utility
US 5,150,581 · App. 07/720,023
Head pressure controller for air conditioning and refrigeration systems
Inventor:
Glenn Smith
Patented Case
View Patent ↗
Granted: Sep 29, 1992
Filed: Jun 24, 1991
Inventor
Glenn Smith
Assignee (at issue)
Baltimore Aircoil Company, 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.