Granted Patent
Utility
US 4,322,260 · App. 06/026,841
Process for the continuous extrusion forming of a plastic double-walled foam-core conduit
Inventor:
Lawrence E. Conlon
Patented Case
View Patent ↗
Granted: Mar 30, 1982
Filed: Apr 4, 1979
Inventor
Lawrence E. Conlon
Assignee (at issue)
Monsanto Company
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.