US3134740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cross-linked chelating resins
Assignee: Dow Chemical Co
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Filing: 1959-10-05
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Granted: 1964-05-26
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Expires: 1979-10-05
Abstract
No abstract record available.
Inventors
- 👤 David P Sheetz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:35
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/02; C08G73/0206; C08G73/0213; B; B01; B01J; B01J45/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
A CROSS-LINKED, WATER-INSOLUBLE CHELATING RESIN OBTAINED BY THE ADDITION POLYMERIZATION OF AN ETHYLENICALLY UNSATURATED DERIVATIVE OF POLYETHYLENIMINE, SAID DERIVATIVE BEING PREPARED FROM POLYETHYLENIMINE HAVING A MOLECULAR WEIGHT OF FROM ABOUT 1,000 TO ABOUT 100,000 AND CONSISTING ESSENTIALLY OF THE RECURRING STRUCTURE
Claim 2
Dependent Claim
41 words
A CROSS-LINKED, WATER-INSOLUBLE CHELATING RESIN OBTAINED BY THE ADDITION POLYMERIZATION OF AN ETHYLENICALLY UNSATURATED DERIVATIVE OF POLYETHYLENIMINE, SAID DERIVATIVE BEING PREPARED FROM POLYETHYLENIMINE HAVING A MOLECULAR WEIGHT OF FROM ABOUT 1,000 TO ABOUT 100,000 AND CONSISTING ESSENTIALLY OF THE RECURRING STRUCTURE
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-05-26 | 1967-11-25 | 1968-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-26 | 1971-11-25 | 1972-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-26 | 1975-11-25 | 1976-05-26 | $7700.00 | Window Closed / Lapsed |