Granted Patent
Utility
US 4,855,870 · App. 07/098,286
Assemblies for supporting electrical circuit boards within tubes
Inventors:
Michael K. Russell, Donald L. Wesenberg, Peter A. Leaney
Patented Case
View Patent ↗
Granted: Aug 8, 1989
Filed: Sep 18, 1987
Inventors
Michael K. Russell
Donald L. Wesenberg
Peter A. Leaney
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.