Reverse thermodynamic chemical barrier for nuclear waste over-pack or backfill
Patent 4430256 Issued on February 7, 1984. Estimated Expiration Date: 
July 6, 2001. 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.
July 6, 2001. 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 ReferencesSystem for the storage of radioactive material Fixation by anion exchange of toxic materials in a glass matrix Patent #: 4333847 InventorApplicationNo. 06/280193 filed on 07/06/1981US Classes:588/10, Ceramic or ceramiclike405/129.35, Earthen formation405/129.55, Complete containment structure405/129.65, With treatment588/16, Surrounding with specified material or structure588/17Geological or extraterrestrialExaminersPrimary: Hunt, Brooks H.Attorney, Agent or FirmInternational ClassesG21F 9/34 (20060101)G21F 9/30 (20060101) G21F 9/36 (20060101) AbstractRadioactive waste is stored surrounded by an overpack or backfill containing non-radioactive ions of the same radioactive elements as in the waste form. In place of an overpack of the actinides, there can be used an overpack of the chemically similar lanthanides. Thus, there can be used in the overpack cesium and strontium containing aluminosilicates and cesium, strontium and lanthanide aluminates and silicates.Other References
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