Granted Patent
Utility
US 4,902,047 · App. 07/338,178
Thread connector anti-rotation device
Inventors:
Dale Brian Marietta, Alistair MacDonald
Patented Case
View Patent ↗
Granted: Feb 20, 1990
Filed: Apr 14, 1989
Inventors
Dale Brian Marietta
Alistair MacDonald
Assignee (at issue)
Vetco Gray, LLC
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.