Granted Patent
Utility
US 4,585,921 · App. 06/515,950
Torch operation interlock device
Inventors:
Raymond G. Wilkins, Bruce O. Hatch
Patented Case
View Patent ↗
Granted: Apr 29, 1986
Filed: Jul 20, 1983
Inventors
Raymond G. Wilkins
Bruce O. Hatch
Assignee (at issue)
Thermal Dynamics 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.