Granted Patent
Utility
US 5,334,268 · App. 07/992,179
Method of producing high strength sucker rod coupling
Inventors:
Dean E. Hermanson, Donald F. Hallden, Horace G. Isom
Patented Case
View Patent ↗
Granted: Aug 2, 1994
Filed: Dec 17, 1992
Inventors
Dean E. Hermanson
Donald F. Hallden
Horace G. Isom
Assignee (at issue)
LTV Energy Products Co.
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.