Granted Patent
Utility
US 5,423,480 · App. 08/057,935
Dual capacity thermal expansion valve
Inventors:
Joseph H. Heffner, David Charles Dorste
Patented Case
View Patent ↗
Granted: Jun 13, 1995
Filed: May 7, 1993
Inventors
Joseph H. Heffner
David Charles Dorste
Assignee (at issue)
Sporlan Valve Company
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.