Granted Patent
Utility
US 5,917,691 · App. 08/629,167
Fail-safe valve relay driver circuit for gas burners
Inventor:
Andrew S. Kadah
Patented Case
View Patent ↗
Granted: Jun 29, 1999
Filed: Apr 8, 1996
Inventor
Andrew S. Kadah
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.