Patent US3337480A successfully refreshed from Google Patents.
US3337480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of chelate cationexchange resins
Assignee: Dow Chemical Co
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Filing: 1966-05-31
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Granted: 1967-08-22
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Expires: 1986-05-31
Abstract
No abstract record available.
Inventors
- 👤 Small Hamish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:13
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
IN A PROCESS FOR THE PREPARATION OF A CHELATE RESIN BY REACTING AN INSOLUBLE HALOMETHYLAROMATIC RESIN WITH A WATER-SOLUBLE FUNCTIONAL REAGENT TO BOND A CHELATEEXCHANGE GROUP TO THE AROMATIC RESIN, THE IMPROVEMENT WHICH COMPRISES REACTING: (A) A HALOMETHYLAROMATIC RESIN HAVING AN AVERAGE OF FROM 0.50 TO 1.25 SUBSTITUENT GROUPS PER AROMATIC GROUP, SAID SUBSTITUENTS CONSISTING ESSENTIALLY OF: (1) FROM 0.05 TO 0.45 HYDROPHILIC METHYLENEQUATERNARY AMMONIUM (I) OR SULFONIC (II) GROUPS PER AROMATIC GROUP, SAID HYDROPHILIC GROUPS HAVING THE FORMULAS:
Claim 2
Dependent Claim
79 words
IN A PROCESS FOR THE PREPARATION OF A CHELATE RESIN BY REACTING AN INSOLUBLE HALOMETHYLAROMATIC RESIN WITH A WATER-SOLUBLE FUNCTIONAL REAGENT TO BOND A CHELATEEXCHANGE GROUP TO THE AROMATIC RESIN, THE IMPROVEMENT WHICH COMPRISES REACTING: (A) A HALOMETHYLAROMATIC RESIN HAVING AN AVERAGE OF FROM 0.50 TO 1.25 SUBSTITUENT GROUPS PER AROMATIC GROUP, SAID SUBSTITUENTS CONSISTING ESSENTIALLY OF: (1) FROM 0.05 TO 0.45 HYDROPHILIC METHYLENEQUATERNARY AMMONIUM (I) OR SULFONIC (II) GROUPS PER AROMATIC GROUP, SAID HYDROPHILIC GROUPS HAVING THE FORMULAS:
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) | 1970-08-21 | 1971-02-20 | 1971-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-21 | 1975-02-20 | 1975-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-21 | 1979-02-20 | 1979-08-22 | $7700.00 | Window Closed / Lapsed |