US3071570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidative demethylation of lignin
Assignee: West Virginia Pulp and Paper Co
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Filing: 1961-06-06
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Granted: 1963-01-01
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Expires: 1981-06-06
Abstract
No abstract record available.
Inventors
- 👤 Marton Joseph
- 👤 Adler Erich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:33
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/0007
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
THE METHOD OF OXIDATIVELY DEMETHYLATING ALKALI LIGNIN WHICH COMPRISES REACTING SAID LIGNIN WITH AN OXIDIZING AGENT, SELECTED FROM THE GROUP CONSISTING OF SODIUM AND POTASSIUM SALTS OF BISMUTHATE, PERIODATE, PERSULFATE, TUNGSTENATE, CHLORITE, HYPOCHLORIDE, HYPOBROMIDE, ANDD HYPOIDODIDE ANIONS CHLORINE DIOXIDE WITH CHLORINE, HYDROGEN PEROXIDE, AND OZONE, TO CONVERT GUAIACOL STRUCTURES INTO O-QUINOID STRUCTURES, AND, BEFORE THE OCCURRENCE OF A SIGNIFICANT DEGREE OF POLYMERIZATION BY DIENE ADDITION OF SAID QUINOID STRUCTURES, STOPPING THE REACTION WITH A REDUCING AGENT SELECTED FROM THE GROUP CONSISTING OF SULFUR DIOXIDE, SULFUROUS ACID, SODIUM THIOSULFATE, AND POTASSIUM THIOSULFATE, TO CONVERT SAID O-QUINOID STRUCTURES INTO PYROCATECHOL STRUCTURES.
Claim 2
Independent Claim
99 words
THE METHOD OF OXIDATIVELY DEMETHYLATING ALKALI LIGNIN WHICH COMPRISES REACTING SAID LIGNIN WITH AN OXIDIZING AGENT, SELECTED FROM THE GROUP CONSISTING OF SODIUM AND POTASSIUM SALTS OF BISMUTHATE, PERIODATE, PERSULFATE, TUNGSTENATE, CHLORITE, HYPOCHLORIDE, HYPOBROMIDE, ANDD HYPOIDODIDE ANIONS CHLORINE DIOXIDE WITH CHLORINE, HYDROGEN PEROXIDE, AND OZONE, TO CONVERT GUAIACOL STRUCTURES INTO O-QUINOID STRUCTURES, AND, BEFORE THE OCCURRENCE OF A SIGNIFICANT DEGREE OF POLYMERIZATION BY DIENE ADDITION OF SAID QUINOID STRUCTURES, STOPPING THE REACTION WITH A REDUCING AGENT SELECTED FROM THE GROUP CONSISTING OF SULFUR DIOXIDE, SULFUROUS ACID, SODIUM THIOSULFATE, AND POTASSIUM THIOSULFATE, TO CONVERT SAID O-QUINOID STRUCTURES INTO PYROCATECHOL STRUCTURES.
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) | 1965-12-31 | 1966-07-02 | 1967-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-31 | 1970-07-02 | 1971-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-31 | 1974-07-02 | 1975-01-01 | $7700.00 | Window Closed / Lapsed |