Patent US4116860A successfully refreshed from Google Patents.
US4116860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regenerant composition and method for regeneration of weak acid cation exchange resin
Assignee: Rohm and Haas Co
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Filing: 1977-09-28
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Granted: 1978-09-26
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Expires: 1997-09-28
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
2026-11-08 14:47
CPC Classifications
B; B01; B01J; B01J49/00; B01J49/50; B01J49/53
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
34 words
A composition for regenerating weak acid cation exchange resin comprising about 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
34 words
A composition for regenerating weak acid cation exchange resin comprising about 70 to 80 weight percent alkali metal chloride, about 5 to 15 percent alkali metal carbonate, and the balance alkali metal chelating polycarboxylate.
Claim 3
Dependent Claim
37 words
The composition of claim 1 wherein the alkali metal chloride is sodium or potassium chloride, the alkali metal carbonate is sodium or potassium carbonate, and the alkali metal chelating polycarboxylate is sodium or potassium citrate or fumerate.
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) | 1981-09-25 | 1982-03-27 | 1982-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-25 | 1986-03-27 | 1986-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-25 | 1990-03-27 | 1990-09-26 | $7700.00 | Window Closed / Lapsed |