Granted Patent
Utility
US 4,521,132 · App. 06/494,811
Apparatus and method for simultaneously tensioning pipes
Inventors:
John E. Isakson, H. Eugene Nutting
Patented Case
View Patent ↗
Granted: Jun 4, 1985
Filed: May 16, 1983
Inventors
John E. Isakson
H. Eugene Nutting
Assignee (at issue)
Western Gear Machinery 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.