Granted Patent
Utility
US 4,486,895 · App. 06/458,415
X-Ray tube voltage indicator
Inventor:
Richard Barrett
Patented Case
View Patent ↗
Granted: Dec 4, 1984
Filed: Jan 17, 1983
Inventor
Richard Barrett
Assignee (at issue)
The Machlett Laboratories, 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.