Granted Patent
Utility
US 4,940,875 · App. 07/313,932
Force limiting weld head
Inventors:
William H. Hill, Joseph E. Donner
Patented Case
View Patent ↗
Granted: Jul 10, 1990
Filed: Feb 22, 1989
Inventors
William H. Hill
Joseph E. Donner
Assignee (at issue)
Hughes Aircraft Company
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.