US2980607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of aqueous liquid solutions of chelate-forming metal ions with chelate exchange resins
Assignee: Dow Chemical Co
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Filing: 1957-05-10
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Granted: 1961-04-18
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Expires: 1977-05-10
Abstract
No abstract record available.
Inventors
- 👤 Richard A Mock
- 👤 Russel C Calkins
- 👤 Charles A Marshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:32
CPC Classifications
B; B01; B01J; B01J45/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A METHOD WHICH COMPRISES CONTACTING AN AQUEOUS LIQUID SOLUTION OF AN IONIZABLE METAL COMPOUD WITH A SOLID CHELATE EXCHANGE RESIN INSOLUBLE BUT SWELLABLE THEREIN, THE RESIN BEING ONE WHOSE MOLECULAR STRUCTURE IS AN ADDITION POLYMER OF AN AR-VINYLPHENYL ALIPHATIC AMINOCARBOXYLIC ACID HAVING THE MONOMERIC FORMULA
Claim 2
Independent Claim
45 words
A METHOD WHICH COMPRISES CONTACTING AN AQUEOUS LIQUID SOLUTION OF AN IONIZABLE METAL COMPOUD WITH A SOLID CHELATE EXCHANGE RESIN INSOLUBLE BUT SWELLABLE THEREIN, THE RESIN BEING ONE WHOSE MOLECULAR STRUCTURE IS AN ADDITION POLYMER OF AN AR-VINYLPHENYL ALIPHATIC AMINOCARBOXYLIC ACID HAVING THE MONOMERIC FORMULA
References Cited (Backward Citations)
US2875162A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |