US2664397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion-exchange resins from carboxyalkyl cellulose ethers
Assignee: Phillips Petroleum Co
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Filing: 1947-09-16
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Granted: 1953-12-29
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Expires: 1967-09-16
Abstract
No abstract record available.
Inventors
- 👤 William M Hutchinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:06
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/02; C08B11/04; C08B11/10; C08B11/12; B; B01; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/22
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
124 words
THE METHOD OF REMOVING CATIONS FROM WATER CONTAINING SAID CATIONS COMPRISING CONTACTING SAID WATER WITH A SUBSTANTIALLY INSOLUBLE CATION EXCHANGE RESIN SELECTED FROM THE GROUP OF SUBSTANTIALLY INSOLUBLE CATION EXCHANGE RESINS CONSISTING OF THE FREE ACID AND ALKALI METAL SALTS OF THE REACTION PRODUCT OF A CARBOXYALKYL CELLULOSE SELECTED FROM THE GROUP OF CARBOXYALKYL CELLULOSES IN WHICH THE ALKYL RADICAL OF THE CARBOXYALKYL GROUP CONTAINS 1 TO 3 CARBON ATOMS AND AN ACYLATING AGENT SELECTED FROM THE GROUP OF ACYLATING AGENTS CONSISTING OF ACID ANHYDRIDES AND ACID HALIDES CONTAINING THE GROUP -COR'''' IN WHICH R" REPRESENTS AN ALKYL RADICAL SELECTED FROM THE GROUP OF ALKYL RADICALS CONTAINING FROM 1 TO 3 CARBON ATOMS PER RADICAL, AND REMOVING THE CONTACTED WATER FROM SAID REACTION PRODUCT.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-28 | 1957-06-29 | 1957-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-28 | 1961-06-29 | 1961-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-28 | 1965-06-29 | 1965-12-29 | $7700.00 | Window Closed / Lapsed |