US2830104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the recovery of naphthalene
Assignee: Individual
•
Filing: 1954-07-15
•
Granted: 1958-04-08
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Expires: 1974-07-15
Abstract
No abstract record available.
Inventors
- 👤 Speckhardt George
- 👤 Hennig Karlheinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:37
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D9/0059; C; C07; C07C; C07C7/00; C07C7/14; Y; Y10; Y10S; Y10S425/00; Y10S425/812
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
A PROCESS FOR THE PRODUCTION OF NAPHATHALENE HAVING A MELTING POINT ABOUT 79*C. FROM IMPURE NAPHTHALENE CONTAINING OIL HAVING A MELTING POINT BELOW 79*C., COMPRISING (1) TREATING SAID IMPURE NAPHTHALENE WITH A SOLVENT IN AN AMOUNT OF 0.5 TO 100 PARTS PER 100 PARTS OF NAPHTHALENE, SAID SOLVENT PREFERENTIALLY DISSOLVING ONE OF NAPHTHALENE AND THE IMPURITIES THEREIN, (2) COOLING THE RESULTING MIXTUE OF IMPURE NAPHTHALENE AND SOLVENT, IN ORDER TO OBTAIN NAPHTHALENE CRYSTALS IN LUMPY CONDITION, AND (3) THEREAFTER TREATING SAID IMPURE LUMPY NAPHTHALENE CONTAINING 0.5 TO 10 PARTS OF SOLVENT IN A CONTINUOUSLY OPERATING PRESS UNDER A CONTINUOUS KNEADING ACTION WHILE ADVANCING THE NAPHTHALENE THROUGH THE PRESS AT A PROGRESSIVELY INCREASING PRESSURE AS IT ADVANCES THERETHROUGH, SAID PRESSURE BEING SUFFICIENT TO SIMULTANEOUSLY EXPRESS SUBSTANTIALLY ALL OF THE OIL FROM NAPHTHALENE SO THAT, BY THE TIME THE NAPHTHALENE HAS ADVANCED COMPLETELY THROUGH SAID PRESS, IT IS IN SUBSTANTIALLY DRY FORM AND HAS A MELTING POINT ABOVE ABOUT 79*C.
Claim 2
Dependent Claim
158 words
A PROCESS FOR THE PRODUCTION OF NAPHATHALENE HAVING A MELTING POINT ABOUT 79*C. FROM IMPURE NAPHTHALENE CONTAINING OIL HAVING A MELTING POINT BELOW 79*C., COMPRISING (1) TREATING SAID IMPURE NAPHTHALENE WITH A SOLVENT IN AN AMOUNT OF 0.5 TO 100 PARTS PER 100 PARTS OF NAPHTHALENE, SAID SOLVENT PREFERENTIALLY DISSOLVING ONE OF NAPHTHALENE AND THE IMPURITIES THEREIN, (2) COOLING THE RESULTING MIXTUE OF IMPURE NAPHTHALENE AND SOLVENT, IN ORDER TO OBTAIN NAPHTHALENE CRYSTALS IN LUMPY CONDITION, AND (3) THEREAFTER TREATING SAID IMPURE LUMPY NAPHTHALENE CONTAINING 0.5 TO 10 PARTS OF SOLVENT IN A CONTINUOUSLY OPERATING PRESS UNDER A CONTINUOUS KNEADING ACTION WHILE ADVANCING THE NAPHTHALENE THROUGH THE PRESS AT A PROGRESSIVELY INCREASING PRESSURE AS IT ADVANCES THERETHROUGH, SAID PRESSURE BEING SUFFICIENT TO SIMULTANEOUSLY EXPRESS SUBSTANTIALLY ALL OF THE OIL FROM NAPHTHALENE SO THAT, BY THE TIME THE NAPHTHALENE HAS ADVANCED COMPLETELY THROUGH SAID PRESS, IT IS IN SUBSTANTIALLY DRY FORM AND HAS A MELTING POINT ABOVE ABOUT 79*C.
References Cited (Backward Citations)
GB255429A
Cited
US2321117A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-07 | 1961-10-07 | 1962-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-07 | 1965-10-07 | 1966-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-07 | 1969-10-07 | 1970-04-08 | $7700.00 | Window Closed / Lapsed |