Granted Patent
Utility
US 4,373,754 · App. 06/270,315
Threaded connector
Inventors:
Charles A. Bollfrass, Leonard Landriault, Patrick E. McDonald
Patented Case
View Patent ↗
Granted: Feb 15, 1983
Filed: Jun 4, 1981
Inventors
Charles A. Bollfrass
Leonard Landriault
Patrick E. McDonald
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.