Granted Patent
Utility
US 4,655,291 · App. 06/778,790
Injector for coupled pipe
Inventor:
Don C. Cox
Patented Case
View Patent ↗
Granted: Apr 7, 1987
Filed: Sep 23, 1985
Inventor
Don C. Cox
Assignee (at issue)
Otis Engineering Corporation
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.