US4071446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for regeneration of weak acid cation exchange resin
Assignee: Rohm and Haas Co
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Filing: 1976-06-21
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Granted: 1978-01-31
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Expires: 1996-06-21
Abstract
Abstract A composition for regenerating weak acid cation exchange resin comprising about 70-80 weight percent alkali metal chloride, about 5-15 weight percent alkali metal carbonate, and the balance an alkali metal chelating polycarboxylate and a method of regeneration comprising contacting the resin with a solution of the composition are disclosed.
Inventors
- 👤 Robert Kunin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:54
CPC Classifications
B; B01; B01J; B01J49/00; B01J49/50; B01J49/53
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
A process for regenerating a weak acid cation exchange resin comprising contacting the resin with a solution of 70 to 80 weight percent alkali metal chloride, about 5 to 15 percent alkali metal carbonate and the balance alkali metal chelating polycarboxylate.
Claim 2
Dependent Claim
41 words
A process for regenerating a weak acid cation exchange resin comprising contacting the resin with a solution of 70 to 80 weight percent alkali metal chloride, about 5 to 15 percent alkali metal carbonate and the balance alkali metal chelating polycarboxylate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-30 | 1981-08-01 | 1982-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-30 | 1985-08-01 | 1986-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-30 | 1989-08-01 | 1990-01-31 | $7700.00 | Window Closed / Lapsed |