Granted Patent
Utility
US 4,734,555 · App. 07/051,476
Method and apparatus for measuring and controlling indentation in resistance welding
Inventor:
Hugo S. Ferguson
Patented Case
View Patent ↗
Granted: Mar 29, 1988
Filed: May 18, 1987
Inventor
Hugo S. Ferguson
Assignee (at issue)
Duffers Scientific, Inc.
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.