Granted Patent
Utility
US 4,570,982 · App. 06/458,733
Tubular joint with trapped mid-joint metal-to-metal seal
Inventors:
Thomas L. Blose, K. Darrel Chelette
Patented Case
View Patent ↗
Granted: Feb 18, 1986
Filed: Jan 17, 1983
Inventors
Thomas L. Blose
K. Darrel Chelette
Assignee (at issue)
Hydril 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.