Granted Patent
Utility
US 4,452,310 · App. 06/322,318
Metal-to-metal high/low pressure seal
Inventors:
Ronald E. Pringle, William D. Eatwell
Patented Case
View Patent ↗
Granted: Jun 5, 1984
Filed: Nov 17, 1981
Inventors
Ronald E. Pringle
William D. Eatwell
Assignee (at issue)
Camco Inc.
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.