Granted Patent
Utility
US 4,728,850 · App. 06/881,635
Mounting means for mounting spiral wire cathodes
Inventors:
Reinhardt Kraft, Horst Ranke
Patented Case
View Patent ↗
Granted: Mar 1, 1988
Filed: Jul 3, 1986
Inventors
Reinhardt Kraft
Horst Ranke
Assignee (at issue)
Leybold-Heraeus GmbH
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.