Granted Patent
Utility
US 5,361,791 · App. 08/137,589
Cleaning of the exterior surface of a pipeline to remove coatings
Inventors:
Gordon R. Chapman, Charles M. Reid, James B. Seale, Donald R. Andruik
Patented Case
View Patent ↗
Granted: Nov 8, 1994
Filed: Oct 15, 1993
Inventors
Gordon R. Chapman
Charles M. Reid
James B. Seale
Donald R. Andruik
Assignee (at issue)
CRC-Evans Rehabilitation Systems, Inc.
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.