Use of crystalline layered sodium silicates for softening water and a process for softening water
Patent 4664839 Issued on May 12, 1987. Estimated Expiration Date: 
April 9, 2005. 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 9, 2005. 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 3840348 3918921 Process for preparing a pyrophosphate-silicate detergent product Patent #: 4019998 InventorApplicationNo. 06/721287 filed on 04/09/1985US Classes:252/175, WATER-SOFTENING OR PURIFYING OR SCALE-INHIBITING AGENTS210/687, Calcium or magnesium (e.g., hardness, water softening, etc.)252/179, Water-insoluble base-exchange agent containing510/532Aluminum or boron containing metal silicate component (e.g., aluminosilicate, zeolite, etc.)ExaminersPrimary: Willis, Prince E.Attorney, Agent or FirmInternational ClassesC02F 5/08 (20060101)C11D 3/12 (20060101) Foreign Application Priority Data1984-04-11 DEAbstractCrystalline layered sodium silicates having the composition NaMSix O2x+1.y H2 O, in which M denotes sodium or hydrogen, x is a number from 1.9 to 4 and y is a number from 0 to 20, are used for softening water containing calcium and/or magnesium ions. | |
