US3793299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellulose graft polymer ion exchange material
Assignee: Procter and Gamble Co
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Filing: 1972-10-02
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Granted: 1974-02-19
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Expires: 1992-10-02
Abstract
Abstract A RAPID EXCHANGE, HIGH CAPACITY CELLULOSE GRAFT POLYMER CATIONIC EXCHANGE MATERIAL IS OBTAINED BY GRAFT POLYMERIZING A VINYL MONOMER ONTO CELLULOSE AND THEREAFTER CONTACTING THE GRAFTED CELLULOSE WITH CONCENTRATED CAUSTIC AT ELEVATED TEMPERATURE. THE VINYL MONOMER IS SELECTED FROM CARBOXYLATED VINYL COMPOUNDS OR FROM VINYL COMPOUNDS POSSESSING A FUNCTIONAL GROUP WHICH IS CONVERTIBLE TO CARBOXYL ON HYDROLYSIS.
Inventors
- 👤 R Zimmerer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:34
CPC Classifications
B; B01; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/22; C; C08; C08F; C08F251/00; C08F251/02
Claims Analysis
Total Claims: 0
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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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |