Granted Patent
Utility
US 4,610,834 · App. 06/780,374
Apparatus and method for installing internal annular rings in tubular box members
Inventors:
Burwell E. Baron, Gary E. Kirsch, Keith C. Mott
Patented Case
View Patent ↗
Granted: Sep 9, 1986
Filed: Sep 26, 1985
Inventors
Burwell E. Baron
Gary E. Kirsch
Keith C. Mott
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.