Granted Patent
Utility
US 5,796,211 · App. 08/640,592
Microwave vacuum tube devices employing electron sources comprising activated ultrafine diamonds
Inventors:
John Edwin Graebner, Sungho Jin, Gregory Peter Kochanski, Wei Zhu
Patented Case
View Patent ↗
Granted: Aug 18, 1998
Filed: May 1, 1996
Inventors
John Edwin Graebner
Sungho Jin
Gregory Peter Kochanski
Wei Zhu
Assignee (at issue)
LUCENT TECHNOLOGIES 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.