Granted Patent
Utility
US 4,460,121 · App. 06/417,335
Thermally controlled vent damper
Inventor:
Warren R. Hedrick
Patented Case
View Patent ↗
Granted: Jul 17, 1984
Filed: Sep 13, 1982
Inventor
Warren R. Hedrick
Assignee (at issue)
Interpace 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.