Granted Patent
Utility
US 3,940,855 · App. 05/490,201
Pipeline pig
Inventors:
Burton Ver Nooy, Larry D. Payne, Robert L. Kendall
Patented Case
View Patent ↗
Granted: Mar 2, 1976
Filed: Jul 19, 1974
Inventors
Burton Ver Nooy
Larry D. Payne
Robert L. Kendall
Assignee (at issue)
T.D. WILLIAMSON
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.