Granted Patent
Utility
US 4,235,586 · App. 05/917,235
Gas ignition control
Inventor:
James A. Hirsch
Patented Case
View Patent ↗
Granted: Nov 25, 1980
Filed: Jun 20, 1978
Inventor
James A. Hirsch
Assignee (at issue)
Carborundum 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.