Patent US2858348A successfully refreshed from Google Patents.
US2858348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making naphthalene
Assignee: Sinclair Refining Co
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Filing: 1957-03-12
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Granted: 1958-10-28
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Expires: 1977-03-12
Abstract
No abstract record available.
Inventors
- 👤 Jr George Bosmajian
- 👤 Jr Henry D Ballard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:07
CPC Classifications
C; C07; C07C; C07C15/00; C07C15/20; C07C15/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
THE METHOD OF PRODUCING NAPHTHALENE WHICH COMPRISES CONTACTING A THERMAL TAR, DERIVED BY CATALYTIC AND THERMAL CRACKING OF A THERMAL TAR, DERIVED BY CATALYTIC AND BOILING IN THE RANGE OF ABOUT 400 TO ABOUT 650*F., AND SATISFYING THE FORMULA X=WEIGHT PERCENT METHYL NAPTHALENEX0.7+WEIGHT PERCENT ALKYL NAPHTHALENES OF MOLECULAR WEIGHT HIGHER THAN METHYL NAPHTHALENEX0.55=AT LEAST ABOUT 20 WITH A HYDROFORMING CATALYST HAVING A NON-COMBUSTIBLE BASE IN THE PRESENCE OF FREE HYDROGEN AT A TEMPEATURE OF ABOUT 950 TO ABOUT 1200*F. AND A PRESSURE OF FREE HYDROGEN AND HYDROCARBON BOILING ABOVE ABOUT 400*F. AT LEAST ABUT 500 P. S. I.,M AND SEPARATING A FRACTION RICH IN NAPHTHALENE, THE RELATIONSHIP.
Claim 2
Independent Claim
107 words
THE METHOD OF PRODUCING NAPHTHALENE WHICH COMPRISES CONTACTING A THERMAL TAR, DERIVED BY CATALYTIC AND THERMAL CRACKING OF A THERMAL TAR, DERIVED BY CATALYTIC AND BOILING IN THE RANGE OF ABOUT 400 TO ABOUT 650*F., AND SATISFYING THE FORMULA X=WEIGHT PERCENT METHYL NAPTHALENEX0.7+WEIGHT PERCENT ALKYL NAPHTHALENES OF MOLECULAR WEIGHT HIGHER THAN METHYL NAPHTHALENEX0.55=AT LEAST ABOUT 20 WITH A HYDROFORMING CATALYST HAVING A NON-COMBUSTIBLE BASE IN THE PRESENCE OF FREE HYDROGEN AT A TEMPEATURE OF ABOUT 950 TO ABOUT 1200*F. AND A PRESSURE OF FREE HYDROGEN AND HYDROCARBON BOILING ABOVE ABOUT 400*F. AT LEAST ABUT 500 P. S. I.,M AND SEPARATING A FRACTION RICH IN NAPHTHALENE, THE RELATIONSHIP.
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) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |