Granted Patent
Utility
US 6,056,533 · App. 09/044,535
Apparatus for conduit extrusion
Inventors:
Thomas W. Hawkins, Michael Schäfer, Jesse Ellison
Patented Case
View Patent ↗
Granted: May 2, 2000
Filed: Mar 19, 1998
Inventors
Thomas W. Hawkins
Michael Schäfer
Jesse Ellison
Assignee (at issue)
The Lamson & Sessions Co.
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.