Granted Patent
Utility
US 5,587,586 · App. 08/538,512
Particle-optical apparatus comprising an electron source with a needle and a membrane-like extraction electrode
Inventor:
Pieter Kruit
Patented Case
View Patent ↗
Granted: Dec 24, 1996
Filed: Oct 3, 1995
Inventor
Pieter Kruit
Assignee (at issue)
U.S. Philips Corporation
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.