US2776326A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-catalytic demethylation of toluene
Assignee: Sunoco Inc
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Filing: 1954-03-26
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Granted: 1957-01-01
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Expires: 1974-03-26
Abstract
No abstract record available.
Inventors
- 👤 Schneider Abraham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:20
CPC Classifications
C; C07; C07C; C07C4/00; C07C4/08; C07C4/12; C07C4/14; C07C4/16
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
79 words
PROCESS FOR THE DEMETHYLATION OF A METHYL SUBSTITUTED AROMATIC HYDROCARBON WHICH COMPRISES HEATING, AT A PRESSURE OF FROM 75 TO 700 P.S.I.G. IN THE ABSENCE OF CATALYTIC MATERIALS, A REACTION MIXTURE CONSISTING OF SAID AROMATIC HYDROCARBON AND AN ACYCLIC HYDROCARBON HAVING FROM 2 TO 5 CARBON ATOMS TO WITHIN THE TEMPERATURE RANGE OF FROM 500*C. TO 800*C., WHEREIN THE MOLE RATIO OF ACYCLIC HYDROCARBON TO SAID AROMATIC HYDROCARBON IS FROM 0.5:1 TO 20:1, WHEREBY SAID AROMATIC DEHYDROCARBON IS DEMETHYLATED.
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) | 1960-01-01 | 1960-07-02 | 1961-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-01 | 1964-07-02 | 1965-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-01 | 1968-07-02 | 1969-01-01 | $7700.00 | Window Closed / Lapsed |