Method for making moisture insensitive zinc sulfide based luminescent materials
Patent 5080928 Issued on January 14, 1992. Estimated Expiration Date: 
October 5, 2010. 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.
October 5, 2010. 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 ReferencesMethod for coating phosphor particles Electroluminescent lamps and phosphors Patent #: 4855189 InventorsAssigneeApplicationNo. 593451 filed on 10/05/1990US Classes:427/70, Nonmetallic coating formed by vapor deposition427/66, Electroluminescent lamp427/69, Vapor deposition427/213, Fluidized bed utilized427/215, Inorganic base427/220, Organic coating427/255.395, Inorganic coating427/255.6Organic coating applied by vapor, gas, or smokeExaminersPrimary: Beck, ShriveAssistant: Burke, Margaret Attorney, Agent or FirmForeign Patent References
International ClassesB05D 005/12B05D 007/00 C23C 016/00 C23C 016/44 AbstractA process is disclosed for coating phosphors with hydrolyzed alkylaluminum. The hydrolyzed alkylaluminum coating renders the phosphors insensitive to atmospheric moisture. the coating process involves vaporizing an aluminum-containing precursor such as trimethylaluminum or triethylaluminum in an inert gas stream and passing this through a fluidized bed containing the phosphor particles. Water vapor is also passed through the fluidized bed and the water and aluminum precursor react on the surface of the phosphor particles to form hydrolyzed trimethylaluminum or other alkylaluminum. The hydrolyzed trimethylaluminum or other alkylaluminum phosphors are particularly useful in electroluminescent lamps.Other References
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