Granted Patent
Utility
US 4,595,053 · App. 06/622,603
Metal-to-metal seal casing hanger
Inventors:
Bruce J. Watkins, Marcelo P. Rosero
Patented Case
View Patent ↗
Granted: Jun 17, 1986
Filed: Jun 20, 1984
Inventors
Bruce J. Watkins
Marcelo P. Rosero
Assignee (at issue)
Hughes Tool Company 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.