US3769272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lignin adduct
Assignee: Westvaco Corp
•
Filing: 1972-05-25
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Granted: 1973-10-30
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Expires: 1992-05-25
Abstract
Abstract LIGNIN ADDUCTS COMPRISING THE REACTION PRODUCT OF LIGNIN WITH UP TO 20 MOLES OF 3-CHLORO-2-HYDROXYPROPANE1-SULFONATE PER 1000 GRAMS OF LIGNIN. THESE ADDUCTS ARE WATER SOLUBLE AND ARE USEFUL AS SURFACTANTS, PARTICULARLY DISPERSANTS.
Inventors
- 👤 H Hintz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:33
CPC Classifications
C; C08; C08H; C08H6/00; C09; C09K; C09K8/00; C09K8/02; C09K8/03; C09K8/035; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/03
Claims Analysis
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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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |