Granted Patent
Utility
US 5,349,839 · App. 08/043,014
Flexible constraining apparatus and method for the stretch forming of elongated hollow metal sections
Inventors:
Robert Weykamp, Robert P. Evert
Patented Case
View Patent ↗
Granted: Sep 27, 1994
Filed: Apr 5, 1993
Inventors
Robert Weykamp
Robert P. Evert
Assignee (at issue)
Aluminum Company of America
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.