Granted Patent
Utility
US 4,365,136 · App. 06/237,296
Zone refinement of inertia welded tubulars to impart improved corrosion resistance
Inventor:
Theodore Gottlieb
Patented Case
View Patent ↗
Granted: Dec 21, 1982
Filed: Feb 23, 1981
Inventor
Theodore Gottlieb
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.