Granted Patent
Utility
US 4,946,304 · App. 07/193,909
Weld joint
Inventor:
Heinz Scharbach
Patented Case
View Patent ↗
Granted: Aug 7, 1990
Filed: May 13, 1988
Inventor
Heinz Scharbach
Assignee (at issue)
PFAUDLER GMBH
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.