Granted Patent
Utility
US 4,663,512 · App. 06/794,288
Plasma-arc torch interlock with pressure sensing
Inventors:
Robert D. Kneeland, Bruce O. Hatch, Richard A. Spaulding
Patented Case
View Patent ↗
Granted: May 5, 1987
Filed: Nov 4, 1985
Inventors
Robert D. Kneeland
Bruce O. Hatch
Richard A. Spaulding
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.