Granted Patent
Utility
US 4,358,511 · App. 06/202,742
Tube material for sour wells of intermediate depths
Inventors:
Darrell F. Smith, Jr., Edward F. Clatworthy
Patented Case
View Patent ↗
Granted: Nov 9, 1982
Filed: Oct 31, 1980
Inventors
Darrell F. Smith, Jr.
Edward F. Clatworthy
Assignee (at issue)
HUNTINGTON ALLOYS CORPORATION
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.