Granted Patent
Utility
US 5,570,603 · App. 08/385,768
Method and apparatus for cold rolling piping element connections having multiple outward steps
Inventors:
Charles N. Chatterley, Michael W. Horgan, Sandra M. Lippka
Patented Case
View Patent ↗
Granted: Nov 5, 1996
Filed: Feb 8, 1995
Inventors
Charles N. Chatterley
Michael W. Horgan
Sandra M. Lippka
Assignee (at issue)
Grinnell LLC
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.