Preparation of rare earth borides
Patent 5176890 Issued on January 5, 1993. Estimated Expiration Date: 
January 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.
January 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 References 3258316 3784677 3902973 Preparation of finely-divided refractory powders of groups III-V metal borides, carbides, nitrides, silicides and sulfides Single-crystal hexaborides and method of preparation Preparation of rare earth borides Patent #: 4999176 InventorsAssigneeApplicationNo. 276664 filed on 11/28/1988US Classes:423/263, RARE EARTH COMPOUND (AT. NO. 21, 39, OR 57-71)423/289Binary compound (e.g., boride, etc.)ExaminersPrimary: Niebling, John F.Assistant: Bolam, Brian M. Attorney, Agent or FirmInternational ClassC01F 017/00Foreign Application Priority Data1987-11-26 FRAbstractThe rare earth borides, e.g., the tetraborides and hexaborides of lanthanum, cerium and praseodymium, are directly prepared by heating/reacting a mixture of at least one rare earth chloride and elemental boron at an elevated temperature, e.g., a temperature ranging from 1,200° to 1,500° C. |
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