Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
John D. Williams0
Rafael A. Martinez0
Lauren P. Rand0
Date of Patent
January 24, 2017
Patent Application Number
15091433
Date Filed
April 5, 2016
Patent Citations Received
Patent Primary Examiner
Patent abstract
The use of the electride form of 12CaO-7Al2O3, or C12A7, as a low work function electron emitter in a hollow cathode discharge apparatus is described. No heater is required to initiate operation of the present cathode, as is necessary for traditional hollow cathode devices. Because C12A7 has a fully oxidized lattice structure, exposure to oxygen does not degrade the electride. The electride was surrounded by a graphite liner since it was found that the C12A7 electride converts to it's eutectic (CA+C3A) form when heated (through natural hollow cathode operation) in a metal tube.
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