Granted Patent
Utility
US 5,638,775 · App. 08/576,608
System for actuating flow control valves in a temperature control system
Inventor:
Thomas J. Hollis
Patented Case
View Patent ↗
Granted: Jun 17, 1997
Filed: Dec 21, 1995
Inventor
Thomas J. Hollis
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.