US2615058A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of purifying naphthalene by crystallization
Assignee: Beazer East Inc
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Filing: 1946-10-19
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Granted: 1952-10-21
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Expires: 1966-10-19
Abstract
No abstract record available.
Inventors
- 👤 Swietoslawski Wojciech
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:28
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A METHOD OF PURIFICATION OF NAPHTHALENE CONTAINING IMPURITIES SUCH AS THIONAPHTHENES AND OILY CONTAMINANTS WHICH COMPRISES DISSOLVING THE IMPURE NAPHTHALENE IN AN EXCESS BY WEIGHT OF A MIXTURE CONSISTING OF METHANOL, THIOPHENE AND WATER, COOLING THE SOLUTION TO A TEMPERATURE OF 50* TO -25* C. TO FULLY CRYSTALLIZE THE NAPHTHALENE AND FORM EUTECTIC MIXTURES OF THE METHANOL WITH THE IMPURITIES, SEPARATING THE CRYSTALLIZED NAPHTHALENE FROM THE SOLUTION BY FILTRATION, AND WASHING THE CRYSTALS WITH THE SOLVENT MIXTURE.
Claim 2
Independent Claim
77 words
A METHOD OF PURIFICATION OF NAPHTHALENE CONTAINING IMPURITIES SUCH AS THIONAPHTHENES AND OILY CONTAMINANTS WHICH COMPRISES DISSOLVING THE IMPURE NAPHTHALENE IN AN EXCESS BY WEIGHT OF A MIXTURE CONSISTING OF METHANOL, THIOPHENE AND WATER, COOLING THE SOLUTION TO A TEMPERATURE OF 50* TO -25* C. TO FULLY CRYSTALLIZE THE NAPHTHALENE AND FORM EUTECTIC MIXTURES OF THE METHANOL WITH THE IMPURITIES, SEPARATING THE CRYSTALLIZED NAPHTHALENE FROM THE SOLUTION BY FILTRATION, AND WASHING THE CRYSTALS WITH THE SOLVENT MIXTURE.
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) | 1955-10-21 | 1956-04-21 | 1956-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-21 | 1960-04-21 | 1960-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-21 | 1964-04-21 | 1964-10-21 | $7700.00 | Window Closed / Lapsed |