Granted Patent
Utility
US 4,581,817 · App. 06/476,492
Drawbar swaging apparatus with segmented confinement structure
Inventor:
John W. Kelly
Patented Case
View Patent ↗
Granted: Apr 15, 1986
Filed: Mar 18, 1983
Inventor
John W. Kelly
Assignee (at issue)
Haskel, 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.