Granted Patent
Utility
US 6,325,278 · App. 09/481,619
Concentric, insulated tubular conduits and method of assembly
Inventors:
Layton R. Bull, Douglas J. Trosclair, Terron A. Adams, Roy J. Blanchard
Patented Case
View Patent ↗
Granted: Dec 4, 2001
Filed: Jan 12, 2000
Inventors
Layton R. Bull
Douglas J. Trosclair
Terron A. Adams
Roy J. Blanchard
Assignee (at issue)
GRANT PRIDECO, L.P.
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.