Granted Patent
Utility
US 4,993,231 · App. 07/487,312
Thermostatic expansion valve with electronic controller
Inventors:
Robert J. Torrence, Marvin F. Gaudette
Patented Case
View Patent ↗
Granted: Feb 19, 1991
Filed: Mar 2, 1990
Inventors
Robert J. Torrence
Marvin F. Gaudette
Assignee (at issue)
Eaton Corporation
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.