Granted Patent
Utility
US 4,667,986 · App. 06/663,476
Wellhead connector
Inventors:
David Johnson, Mark McGinnis
Patented Case
View Patent ↗
Granted: May 26, 1987
Filed: Oct 22, 1984
Inventors
David Johnson
Mark McGinnis
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.