Granted Patent
Utility
US 5,080,006 · App. 07/316,021
Chimney damper device
Inventor:
Hal A. VonSick
Patented Case
View Patent ↗
Granted: Jan 14, 1992
Filed: Feb 27, 1989
Inventor
Hal A. VonSick
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.