Patent US3094515A successfully refreshed from Google Patents.
US3094515A
Expired / Lapsed
US
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Lignin dispersing agents and a method of making the same
Assignee: Lignosol Chemicals Ltd
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Filing: 1961-11-06
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Granted: 1963-06-18
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Expires: 1981-11-06
Abstract
No abstract record available.
Inventors
- 👤 Karl F Keirstead
- 👤 Giguere Jacques
- 👤 Fortin Guy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:06
CPC Classifications
C; C08; C08H; C08H6/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A PROCESS OF PRODUCING A PARTLY DESULPHONATED LIGNIN SULPHONATE DISPERSINNG AGENT WHICH COMPRISES FORMING A LIQUOR CONSISTING ESSENTIALLY OF A LIGNOSULPHONATE, SODIUM HYDROXIDE, AND AT LEAST ONE OF A GROUP CONSISTING OF ZINC, ZINC OXIDE, AND ZINC SALTS, THEN HEATING THE SAID LIQUOR AT A TEMPERATURE OF APPROXIMATELY 156*C. TO 178*C. TO HYDROLYSE SAID LIGNOSULPHONATE, AND DRYING THE RESULTING SOLUTION.
Claim 2
Dependent Claim
60 words
A PROCESS OF PRODUCING A PARTLY DESULPHONATED LIGNIN SULPHONATE DISPERSINNG AGENT WHICH COMPRISES FORMING A LIQUOR CONSISTING ESSENTIALLY OF A LIGNOSULPHONATE, SODIUM HYDROXIDE, AND AT LEAST ONE OF A GROUP CONSISTING OF ZINC, ZINC OXIDE, AND ZINC SALTS, THEN HEATING THE SAID LIQUOR AT A TEMPERATURE OF APPROXIMATELY 156*C. TO 178*C. TO HYDROLYSE SAID LIGNOSULPHONATE, AND DRYING THE RESULTING SOLUTION.
References Cited (Backward Citations)
GB286808A
Cited
US2710225A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-06-17 | 1966-12-17 | 1967-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-17 | 1970-12-17 | 1971-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-17 | 1974-12-17 | 1975-06-18 | $7700.00 | Window Closed / Lapsed |