Granted Patent
Utility
US 4,646,845 · App. 06/640,719
Metal seal for wellhead apparatus
Inventor:
Roy A. Boeker
Patented Case
View Patent ↗
Granted: Mar 3, 1987
Filed: Aug 14, 1984
Inventor
Roy A. Boeker
Assignee (at issue)
Cactus Wellhead Equipment Co., 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.