Granted Patent
Utility
US 4,685,873 · App. 06/799,889
Process for the continuous production of pipe from particulate materials
Inventors:
G. Fred Willard, Michael Wait, David A. Hutchings, Sanford K. Lauderback
Patented Case
View Patent ↗
Granted: Aug 11, 1987
Filed: Nov 20, 1985
Inventors
G. Fred Willard
Michael Wait
David A. Hutchings
Sanford K. Lauderback
Assignee (at issue)
Owens-Corning Fiberglas Corp.
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.