Granted Patent
Utility
US 4,419,557 · App. 06/337,056
Method and apparatus for welding metal parts coated with a thermoplastic
Inventor:
John S. Gellatly
Patented Case
View Patent ↗
Granted: Dec 6, 1983
Filed: Jan 4, 1982
Inventor
John S. Gellatly
Assignee (at issue)
Western Electric Company, 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.