Granted Patent
Utility
US 5,311,745 · App. 08/009,671
Pressure measurement system for refrigeration system
Inventors:
Douglas Lloyd Lockhart, Oreste Varelas
Patented Case
View Patent ↗
Granted: May 17, 1994
Filed: Jan 27, 1993
Inventors
Douglas Lloyd Lockhart
Oreste Varelas
Assignee (at issue)
Digi-Cool Industries Ltd.
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.