Granted Patent
Utility
US 4,568,708 · App. 06/622,694
Composition and method for effecting seals in earth boreholes
Inventors:
Carl Mason, Samuel Geffen
Patented Case
View Patent ↗
Granted: Feb 4, 1986
Filed: Jun 20, 1984
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.