Granted Patent
Utility
US 5,125,869 · App. 07/706,941
Spring biased chimney damper
Inventor:
Hal A. VonSick
Patented Case
View Patent ↗
Granted: Jun 30, 1992
Filed: May 29, 1991
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.