US2686818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extraction process for recovering naphthalene
Assignee: Sinclair Refining Co
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Filing: 1949-06-16
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Granted: 1954-08-17
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Expires: 1969-06-16
Abstract
No abstract record available.
Inventors
- 👤 Kenneth A Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:46
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/06; C10G21/12; C10G21/16; C07; C07C; C07C7/00; C07C7/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
THE METHOD OF RECOVERING NAPHTHALENE FROM A NAPHTHALENE-CONTAINING STOCK WHICH COMPRISES CONTACTING THE STOCK WITH A SOLVENT CONSISTING OF METHANOL AT A TEMPERATURE WITHIN THE RANGE FROM ABOUT 60* TO 160* F. AND A PRESSURE WHEREBY THE METHANOL REMAINS PARTIALLY MISCIBLE WITH THE STOCK AND WHEREBY BOTH COMPONENTS ARE IN THE LIQUID PHASE, TAKING OFF A SOLVENT FRACTION ENRICHED IN NAPHTHALENE-CONTAINING OIL, SEPARATING THE SOLVENT THEREFROM, SAID THEN REMOVING THE NAPHTHALENE FROM THE OIL.
Claim 2
Independent Claim
74 words
THE METHOD OF RECOVERING NAPHTHALENE FROM A NAPHTHALENE-CONTAINING STOCK WHICH COMPRISES CONTACTING THE STOCK WITH A SOLVENT CONSISTING OF METHANOL AT A TEMPERATURE WITHIN THE RANGE FROM ABOUT 60* TO 160* F. AND A PRESSURE WHEREBY THE METHANOL REMAINS PARTIALLY MISCIBLE WITH THE STOCK AND WHEREBY BOTH COMPONENTS ARE IN THE LIQUID PHASE, TAKING OFF A SOLVENT FRACTION ENRICHED IN NAPHTHALENE-CONTAINING OIL, SEPARATING THE SOLVENT THEREFROM, SAID THEN REMOVING THE NAPHTHALENE FROM THE OIL.
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) | 1957-08-16 | 1958-02-15 | 1958-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-16 | 1962-02-15 | 1962-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-16 | 1966-02-15 | 1966-08-17 | $7700.00 | Window Closed / Lapsed |