Granted Patent
Utility
US 4,258,791 · App. 06/116,584
Thermal insulation method
Inventors:
Israel M. Brandt, Forrest A. Scearce
Patented Case
View Patent ↗
Granted: Mar 31, 1981
Filed: Jan 29, 1980
Inventors
Israel M. Brandt
Forrest A. Scearce
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.