Emitter material for cathode ray tube having at least one alkaline earth metal carbonate dispersed or concentrated in a mixed crystal or solid solution
Patent 6222308 Issued on April 24, 2001. Estimated Expiration Date: 
September 19, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 19, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1870951 2703790 2912611 Cathode for electron tube Cathode for electron tube Manufacturing method of oxide cathode Oxide cathode Oxide cathode with rare earth addition 5548184 Thermion emitting oxide cathode and method for making the same InventorsAssigneeApplicationNo. 716019 filed on 09/19/1996US Classes:313/346R, Cathodes containing and/or coated with electron emissive material313/346DC, Dispensator cathode445/50, Emissive type445/51Emissive typeExaminersPrimary: Patel, Nimeshkumar D.Assistant: Haynes, Mack Attorney, Agent or FirmForeign Patent References
International ClassesH01J 001/14H01J 019/06 H01J 009/04 H01K 001/04 Foreign Application Priority Data1995-09-21 JPAbstractAn emitter material for a CRT comprises mixed crystal or solid solution of at least two kinds of alkaline earth metal carbonate, wherein at least one alkaline earth metal carbonate is dispersed or separated in the mixed crystal or solid solution. The alkaline earth metal carbonate, which is an emitter material for the CRT, is coated onto the base metal and thermally decomposed in a vacuum to from an emitter of an alkaline earth metal. This emitter, which is proper for a larger screen size, high brightness and high resolution CRT, can be provided with enough life characteristics even under the operating condition of the emission current density of 2A/cm2.Other References
Field of SearchDISCHARGE DEVICES HAVING A MULTIPOINTED OR SERRATED EDGE ELECTRODEDISCHARGE DEVICES HAVING A THERMIONIC OR EMISSIVE CATHODE Point source cathodes Multipointed or serrated edge electrode Dispensator cathode Cathodes containing and/or coated with electron emissive material Vacuum-type tube For indirectly heated cathode Plural beam generating or control With character forming electrode One cathode source of plural beams Indirectly heated cathodes Emissive type Generating gas or vapor within an envelope, or coating by vapor, gas, mist or smoke within the envelope Controlled vaporizing or coating Depositing plural coatings With diverse type coating operation Coating on particular base material, part or place | |
