Granted Patent
Utility
US 4,978,062 · App. 07/486,804
Thermostatic expansion valve with bi-directional flow
Inventor:
Harold T. Lange
Patented Case
View Patent ↗
Granted: Dec 18, 1990
Filed: Feb 28, 1990
Inventor
Harold T. Lange
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.