Granted Patent
Utility
US 4,674,576 · App. 06/766,365
Casing hanger running tool
Inventors:
Gregg A. Goris, John Pettit, Raymond Rhodes
Patented Case
View Patent ↗
Granted: Jun 23, 1987
Filed: Aug 16, 1985
Inventors
Gregg A. Goris
John Pettit
Raymond Rhodes
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.