Granted Patent
Utility
US 4,403,496 · App. 06/229,861
Tube bender construction
Inventor:
Leonard J. Kowal
Patented Case
View Patent ↗
Granted: Sep 13, 1983
Filed: Jan 30, 1981
Inventor
Leonard J. Kowal
Assignee (at issue)
Imperial Clevite 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.