Patent US2750432A successfully refreshed from Google Patents.
US2750432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of naphthalene
Assignee: ExxonMobil Oil Corp
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Filing: 1952-09-16
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Granted: 1956-06-12
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Expires: 1972-09-16
Abstract
No abstract record available.
Inventors
- 👤 Harry L Coonradt
- 👤 Barton W Rope
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:10
CPC Classifications
C; C07; C07C; C07C4/00; C07C4/08; C07C4/12; C07C4/14; C07C4/18; C07C2521/00; C07C2521/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A PROCESS FOR THE DEMETHYLATION OF METHYLNAPHTHALENES, WHICH COMPRISES CONTACTING A METHYLNAPHTHALENE WITH A SILICA-ALUMINA CRACKING CATALYST, CONTAINING BETWEEN ABOUT 5 PER CENT AND ABOUT 20 PER CENT, BY WEIGHT, OF ALUMINA, AT A TEMPERATURE OF BETWEEN ABOUT 900* F. AND ABOUT 1200* F., FOR A PERIOD OF TIME OF BETWEEN ABOUT ONE SECOND AND ABOUT 60 SECONDS, AND IN THE PRESENCE OF HYDROGEN GAS AT SUBSTANTIALLY ATMOSPHERIC PRESSURE.
Claim 2
Dependent Claim
69 words
A PROCESS FOR THE DEMETHYLATION OF METHYLNAPHTHALENES, WHICH COMPRISES CONTACTING A METHYLNAPHTHALENE WITH A SILICA-ALUMINA CRACKING CATALYST, CONTAINING BETWEEN ABOUT 5 PER CENT AND ABOUT 20 PER CENT, BY WEIGHT, OF ALUMINA, AT A TEMPERATURE OF BETWEEN ABOUT 900* F. AND ABOUT 1200* F., FOR A PERIOD OF TIME OF BETWEEN ABOUT ONE SECOND AND ABOUT 60 SECONDS, AND IN THE PRESENCE OF HYDROGEN GAS AT SUBSTANTIALLY ATMOSPHERIC PRESSURE.
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) | 1959-06-12 | 1959-12-12 | 1960-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-12 | 1963-12-12 | 1964-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-12 | 1967-12-12 | 1968-06-12 | $7700.00 | Window Closed / Lapsed |