US3102151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the dealkylation of alkyl naphthalene
Assignee: Wyeth Holdings LLC
•
Filing: 1958-06-13
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Granted: 1963-08-27
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Expires: 1978-06-13
Abstract
No abstract record available.
Inventors
- 👤 Robert G Haldeman
- 👤 Castellion George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:59
CPC Classifications
C; C07; C07C; C07C15/00; C07C15/20; C07C15/24; C07C4/00; C07C4/08; C07C4/12; C07C4/14; C07C4/18; C07C5/00; C07C5/02; C07C5/10; C07C5/11
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A PROCESS FOR PREPARING A SUBSTANTIALLY SULFUR-FREE NAPHTHALENE SUITABLE FOR READY CONVERSION TO PHTHALIC ANHYDRIDE, WHICH COMPRISES HYDROGENATING AND HYDRODESULFURIZING AN ALKYL NAPHTHALENE CONTAINING FRACTION CONTAINING AT LEAST 0.10% SULFUR, IN THE PRESENCE OF A HYDROGEN CONTAINING GAS AND IN THE PRESENCE OF A DESULFURIZATION CATALYST CAPABLE OF FUNCTIONING BOTH TO CATALYZE THE HYDROGENATION AND DESULFURIZATION AND TO FORM AN INTERMEDIATE SUFLUR-FREE PARTIALLY HYDROGENATED ALKYL NAPHTHALENE CONTAINING FRACTION AND THEAFTER DEHYDROGENATING AND DEALKYLATING SAID FRACTION IN THE PRESENCE OF A DEHYDROGENATION-DEALKYLATION CATALYST WHEREBY A SUBSTANTIALLY SULFUR-FREE NAPHTHALENE IS OBTAINED.
Claim 2
Dependent Claim
89 words
A PROCESS FOR PREPARING A SUBSTANTIALLY SULFUR-FREE NAPHTHALENE SUITABLE FOR READY CONVERSION TO PHTHALIC ANHYDRIDE, WHICH COMPRISES HYDROGENATING AND HYDRODESULFURIZING AN ALKYL NAPHTHALENE CONTAINING FRACTION CONTAINING AT LEAST 0.10% SULFUR, IN THE PRESENCE OF A HYDROGEN CONTAINING GAS AND IN THE PRESENCE OF A DESULFURIZATION CATALYST CAPABLE OF FUNCTIONING BOTH TO CATALYZE THE HYDROGENATION AND DESULFURIZATION AND TO FORM AN INTERMEDIATE SUFLUR-FREE PARTIALLY HYDROGENATED ALKYL NAPHTHALENE CONTAINING FRACTION AND THEAFTER DEHYDROGENATING AND DEALKYLATING SAID FRACTION IN THE PRESENCE OF A DEHYDROGENATION-DEALKYLATION CATALYST WHEREBY A SUBSTANTIALLY SULFUR-FREE NAPHTHALENE IS OBTAINED.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-08-26 | 1967-02-25 | 1967-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-08-26 | 1971-02-25 | 1971-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-08-26 | 1975-02-25 | 1975-08-27 | $7700.00 | Window Closed / Lapsed |