US3763139A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modified lignin surfactants
Assignee: Westvaco Corp
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Filing: 1972-05-25
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Granted: 1973-10-02
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Expires: 1992-05-25
Abstract
Abstract THE IMPROVED LIGNIN SURFACTANT OF THIS INVENTION IS A LIGNIN MODIFIED BY REACTION WITH UP TO 20 MOLES, PREFERABLY FROM 2 TO 10 MOLES, PER 1000 GRAMS OF LIGNIN, OF AN AGENT OF THE TYPE X(CHR)M(CH2)NY, WHEREIN X IS A HALOGEN AN ACTIVATED DOUBLE BOND, SUCH AS IN ACROLEIN, AN EPOXIDE RING OR A HALOHYDRIN, Y IS A PROPERTY GROUP SUCH AS SULFONATE, PHOSPHONATE OR HYDROXYL, R IS A PROPERTY GROUP, SUCH AS HYDROXYL, MERCAPTAN, AMINE OR HYDROGEN, AND N AND M ARE INTEGERS FROM 0 TO 5, AND M AND N TOGETHER ARE AT LEAST 1, TO AT LEAST PARTIALLY BLOCK THE ACIDIC HYDROXYL GROUPS OF THE LIGNIN.
Inventors
- 👤 S Falkehag
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:38
CPC Classifications
C; C08; C08H; C08H6/00; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C09; C09K; C09K8/00; C09K8/02; C09K8/03; C09K8/035
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) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |