Patent US3964509A successfully refreshed from Google Patents.
US3379719A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion exchange fibers
Assignee: Celanese Corp
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Filing: 1964-09-29
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Granted: 1968-04-23
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Expires: 1984-09-29
Abstract
No abstract record available.
Inventors
- 👤 Richard N Rulison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:35
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/322; D06M13/345; D06M13/348; B; B01; B01J; B01J47/00; B01J47/12; B01J47/127; D06M13/10; D06M13/165; D06M13/175; D06M13/244; D06M13/248; D06M13/252; D06M13/325; D06M13/328; D06M13/33
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A CROSS-LINKED CELLULOSIC PRODUCT, SAID CELLULOSIC PRODUCT HAVING BEEN CROSS-LINKED TO A SUBSTANTIALLY INSOLUBLE STATE IN A 1 MOLAR AQUEOUS SOLUTION OF CUPRIETHYLENEDIAMINE AND HAVING AN ION-EXCHANGE CAPACITY OF FROM ABOUT 0.1 TO ABOUT 3 MILIEQUIVALENTS PER GRAM OF ORIGINAL CELLULOSE, THE MOLECULES OF WHICH HAVE A PLURALITY OF BONDS HAVING A FORMULA SELECTED FROM THE GROU-P CONSISTING OF
Claim 2
Dependent Claim
59 words
A CROSS-LINKED CELLULOSIC PRODUCT, SAID CELLULOSIC PRODUCT HAVING BEEN CROSS-LINKED TO A SUBSTANTIALLY INSOLUBLE STATE IN A 1 MOLAR AQUEOUS SOLUTION OF CUPRIETHYLENEDIAMINE AND HAVING AN ION-EXCHANGE CAPACITY OF FROM ABOUT 0.1 TO ABOUT 3 MILIEQUIVALENTS PER GRAM OF ORIGINAL CELLULOSE, THE MOLECULES OF WHICH HAVE A PLURALITY OF BONDS HAVING A FORMULA SELECTED FROM THE GROU-P CONSISTING OF
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) | 1971-04-23 | 1971-10-23 | 1972-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-23 | 1975-10-23 | 1976-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-23 | 1979-10-23 | 1980-04-23 | $7700.00 | Window Closed / Lapsed |