Method for preparing electron emissive coatings
Patent 3951874 Issued on April 20, 1976. Estimated Expiration Date: 
April 20, 1993. 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.
April 20, 1993. 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 2724070 2985548 3464785 3718831 3755553 3758809 3766423 3798492 3837909 3842469 InventorAssigneeApplicationNo. 487082 filed on 07/10/1974US Classes:252/519.32, The organic compound is a natural resin, protein, lignin, carbohydrate, or derivative thereof252/500, ELECTRICALLY CONDUCTIVE OR EMISSIVE COMPOSITIONS423/594.16Alkaline earth metal containing (Mg, Ca, Sr, or Ba)ExaminersPrimary: Padgett, Benjamin R.Assistant: Parr, E. Suzanne Attorney, Agent or FirmAbstractAn improved emissive tantalate coating for fluorescent lamps provides long operational lamp life and low lamp end discoloration. The emissive tantalate has the composition Ba5 Ca4 Ta2 O14 and is applied in powder form to standard fluorescent lamp electrodes.Other References
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