US3270074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of pure methylnaphthalene
Assignee: Ashland LLC
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Filing: 1963-02-05
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Granted: 1966-08-30
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Expires: 1983-02-05
Abstract
No abstract record available.
Inventors
- 👤 Thorwell H Paulsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:15
CPC Classifications
C; C07; C07C; C07C15/00; C07C15/20; C07C15/24; C07C4/00; C07C4/02; C07C4/06; C07C7/00; C07C7/04; C07C7/148; C07C7/163; C07C2521/00; C07C2521/02; C07C2521/04; C07C2523/00; C07C2523/16; C07C2523/24; C07C2523/26; C10; C10G; C10G2400/00; C10G2400/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
159 words
THE PROCESS OF PREPARIN ALPHA- AND BETA-METHYLNAPHTHALENE IN PURITIES OF AT LAST 99.0 PERCENT WHICH COMPRISES, FRACTIONATING TO AN END BOILING POINT BETWEEN ABOUT 490* AND 500*F. A HYDROCARBON FEED CONTAINING SAID METHYLNAPHTHALENES IN ADMIXTURES WITH CONTAMINANTS OF THE ALKYLBENZENE AND PARAFFIN TYPES HAVING BOILING POINTS CLOSE TO THE BOILING POINTS OF SAID METHYLNAPHTHALENES, COMPONENTS OF SAID FEED HAVING BOILING POINTS SUBSTANTIALLY HIGHER THAN SAID METHYLNAPHTHALENES THEREBY BEING REMOVED FRM SAID FEED, SUBJECTING THE FRACTIONATED FEED TO HYDROCRACKING IN THE PRESENCE OF HYDROGEN OVER A CATALYST WHICH COMPRISES 5 TO 25% BY WEIGHT CHROMIA DEPOSITED ON A SUPPORT, SAID SUPPORT COMPRISING A HIGH PURITY LOW SODIUM CONTENT GAMMA TYPE ALUMINA, AT A TEMPERATURE OF ABOUT 200-1300*F., THE CONTAMINANTS IN SAID FRACTIONATED STOCK HAVING BOILING POINTS CLOSE TO THE BOILING POINTS OF SAID METHLNAPHTHALENES THEREBY BEING HYDROCRACKED TO COMPOUNDS HAVING BOILING POINTS NO HIGHER THAN ABOUT 440*F., SAID METHYLNAPHTHALENES BEING HYDROCRACKED AT A SUBSTANTIALLY LOWER RATE THAN SAID CONTAMINANTS, WHEREBY
Claim 2
Dependent Claim
159 words
THE PROCESS OF PREPARIN ALPHA- AND BETA-METHYLNAPHTHALENE IN PURITIES OF AT LAST 99.0 PERCENT WHICH COMPRISES, FRACTIONATING TO AN END BOILING POINT BETWEEN ABOUT 490* AND 500*F. A HYDROCARBON FEED CONTAINING SAID METHYLNAPHTHALENES IN ADMIXTURES WITH CONTAMINANTS OF THE ALKYLBENZENE AND PARAFFIN TYPES HAVING BOILING POINTS CLOSE TO THE BOILING POINTS OF SAID METHYLNAPHTHALENES, COMPONENTS OF SAID FEED HAVING BOILING POINTS SUBSTANTIALLY HIGHER THAN SAID METHYLNAPHTHALENES THEREBY BEING REMOVED FRM SAID FEED, SUBJECTING THE FRACTIONATED FEED TO HYDROCRACKING IN THE PRESENCE OF HYDROGEN OVER A CATALYST WHICH COMPRISES 5 TO 25% BY WEIGHT CHROMIA DEPOSITED ON A SUPPORT, SAID SUPPORT COMPRISING A HIGH PURITY LOW SODIUM CONTENT GAMMA TYPE ALUMINA, AT A TEMPERATURE OF ABOUT 200-1300*F., THE CONTAMINANTS IN SAID FRACTIONATED STOCK HAVING BOILING POINTS CLOSE TO THE BOILING POINTS OF SAID METHLNAPHTHALENES THEREBY BEING HYDROCRACKED TO COMPOUNDS HAVING BOILING POINTS NO HIGHER THAN ABOUT 440*F., SAID METHYLNAPHTHALENES BEING HYDROCRACKED AT A SUBSTANTIALLY LOWER RATE THAN SAID CONTAMINANTS, WHEREBY
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) | 1969-08-29 | 1970-02-28 | 1970-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-29 | 1974-02-28 | 1974-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-29 | 1978-02-28 | 1978-08-30 | $7700.00 | Window Closed / Lapsed |