Granted Patent
Utility
US 4,463,808 · App. 06/387,171
Method for effecting seals in earth boreholes
Inventors:
Carl Mason, Samuel Geffen
Patented Case
View Patent ↗
Granted: Aug 7, 1984
Filed: Jun 10, 1982
Inventors
Carl Mason
Samuel Geffen
Assignee (at issue)
NL Industries, 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.