Water conditioning process
Patent 4083782 Issued on April 11, 1978. Estimated Expiration Date: 
April 11, 1995. 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 11, 1995. 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 2374100 3342730 3414507 3493498 3663163 3767600 InventorAssigneeApplicationNo. 520322 filed on 11/04/1974US Classes:210/674, Utilizing organic regenerant210/681, Removing ions210/687, Calcium or magnesium (e.g., hardness, water softening, etc.)210/688Heavy metalExaminersPrimary: Hart, Charles N.Assistant: Castel, Benoit Attorney, Agent or FirmInternational ClassC02B 001/76AbstractWater is conditioned by contacting it with a weak acid cation exchange resin based upon a crosslinked methacrylic acid copolymer structure in the alkali metal (or ammonium) form. The resin when exhausted may be regenerated by either a two-step acid/alkali technique or by a one-step technique using a citric or fumaric acid solution or a poly or hexamethaphosphate solution. Water by this method is substantially free of hardness ion, dissolved heavy metal ions and has a corrected pH between 7 and 9.5, preferably between 8 and 8.5. | |
