US3326980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of methyl mercaptan from waste pulping liquors
Assignee: Fort James Corp
•
Filing: 1964-12-11
•
Granted: 1967-06-20
•
Expires: 1984-12-11
Abstract
No abstract record available.
Inventors
- 👤 David W Goheen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:29
CPC Classifications
C; C07; C07C; C07C321/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
THE PROCESS OF PREPARING METHYL MERCAPTAN FROM SULFATE BLACK LIQUOR CONTAINING AS SULFUR COMPOUNDS ONLY THOSE PRESENT AS EXHAUSTED COOKING CHEMICALS COMPRISING: EVAPORATING SAID BLACK LIQUOR SUBSTNATIALLY TO DRYNESS; SUBJECTING THE RESULTING SOLIDS TO TUMBLING; SUBJECTING SAID SOLIDS TO A MILD PYROLYSIS IN A PYROLYSIS ZONE AT A TEMPERATURE OF FROM ABOUT 150*C. TO ABOUT 300*C. DURING SAID TUMBLING TO CAUSE THE FORMATION OF VAPOROUS METHYL MERCAPTAN; SUBSTANTIALLY IMMEDIATELY REMOVING SAID VAPOROUS METHYL MERCAPTAN FROM SAID PYROLYSIS ZONE; AND RECOVERING SAID METHYL MERCAPTAN.
Claim 2
Dependent Claim
83 words
THE PROCESS OF PREPARING METHYL MERCAPTAN FROM SULFATE BLACK LIQUOR CONTAINING AS SULFUR COMPOUNDS ONLY THOSE PRESENT AS EXHAUSTED COOKING CHEMICALS COMPRISING: EVAPORATING SAID BLACK LIQUOR SUBSTNATIALLY TO DRYNESS; SUBJECTING THE RESULTING SOLIDS TO TUMBLING; SUBJECTING SAID SOLIDS TO A MILD PYROLYSIS IN A PYROLYSIS ZONE AT A TEMPERATURE OF FROM ABOUT 150*C. TO ABOUT 300*C. DURING SAID TUMBLING TO CAUSE THE FORMATION OF VAPOROUS METHYL MERCAPTAN; SUBSTANTIALLY IMMEDIATELY REMOVING SAID VAPOROUS METHYL MERCAPTAN FROM SAID PYROLYSIS ZONE; AND RECOVERING SAID METHYL MERCAPTAN.
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) | 1970-06-19 | 1970-12-19 | 1971-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-19 | 1974-12-19 | 1975-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-19 | 1978-12-19 | 1979-06-20 | $7700.00 | Window Closed / Lapsed |