Patent US2888441A successfully refreshed from Google Patents.
US2888441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chelating resins having alpha-aminocarboxylic acid groups on a polymerized vinylbenzylamine resin structure
Assignee: Dow Chemical Co
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Filing: 1956-10-12
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Granted: 1959-05-26
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Expires: 1976-10-12
Abstract
No abstract record available.
Inventors
- 👤 Leo R Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:25
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/30; C08F26/00; C08F8/02; C08F8/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
A METHOD OF MAKING CHELATING RESINS HAVING AN APPRECIALBE PROPORTION OF THE RECURRING GROUP
Claim 2
Independent Claim
14 words
A METHOD OF MAKING CHELATING RESINS HAVING AN APPRECIALBE PROPORTION OF THE RECURRING GROUP
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) | 1962-05-25 | 1962-11-24 | 1963-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-25 | 1966-11-24 | 1967-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-25 | 1970-11-24 | 1971-05-26 | $7700.00 | Window Closed / Lapsed |