Granted Patent
Utility
US 4,467,833 · App. 06/301,002
Control valve and electrical and hydraulic control system
Inventors:
Lawrence E. Satterwhite, Lawrence F. Angelo
Patented Case
View Patent ↗
Granted: Aug 28, 1984
Filed: Sep 10, 1981
Inventors
Lawrence E. Satterwhite
Lawrence F. Angelo
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.