Stabilized solutions of sodium dithionite
Patent 4100098 Issued on July 11, 1978. Estimated Expiration Date: 
October 26, 1996. 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 26, 1996. 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 3669895 3773679 3804944 InventorApplicationNo. 05/735356 filed on 10/26/1976US Classes:252/186.25, Composition containing a stabilizer or a product in the form of a surface-modified, impregnated, encapsulated, or surface-coated article; or process of producing said composition252/188.22, Hydrosulfite (dithionite)423/265, WITH ADDITIVE423/515DithioniteExaminersPrimary: Padgett, Benjamin R.Assistant: Parr, E. Suzanne Attorney, Agent or FirmInternational ClassesC01B 17/66 (20060101)C01B 17/00 (20060101) D06P 1/00 (20060101) D06P 1/22 (20060101) D06L 3/00 (20060101) D06L 3/10 (20060101) AbstractAqueous solutions containing mixtures of sodium dithionite and sodium sulfite having concentrations of greater than 13 percent by weight of Na2 S2 O4 are stabilized by adding potassium hydroxide in an amount which is sufficient to provide a residual of from about 1 to about 12 grams per liter of solution. These solutions can be stored at temperatures of from about 0° to about 15° C. without crystallization taking place. |
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