US3281482A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conversion of alkyl aromatics
Assignee: Shell USA Inc
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Filing: 1963-10-25
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Granted: 1966-10-25
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Expires: 1983-10-25
Abstract
No abstract record available.
Inventors
- 👤 Dvoretzky Isaac
- 👤 Hans A Benesi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:30
CPC Classifications
C; C07; C07C; C07C6/00; C07C6/08; C07C6/12; C07C6/123; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/18; C07C5/00; C07C5/22; C07C5/27; C07C5/2702; C07C5/2708
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
A PROCESS FOR ISOMERIZING A XYLENE ISOMER WHICH COMPRISES CONTACTING SAID XYLENE ISOMER IN A REACTION ZONE AT AN ELEVATED TEMPERATURE OF ABOUT 400* TO 900* F. WITH A CATALYST COMPRISING A CRYSTALLINE HYDROGEN ALUMINO-SILICATE, AND RECOVERING FROM THE REACTION ZONE EFFUENT A MIXTURE OF THREE XYLENE ISOMERS.
Claim 2
Dependent Claim
48 words
A PROCESS FOR ISOMERIZING A XYLENE ISOMER WHICH COMPRISES CONTACTING SAID XYLENE ISOMER IN A REACTION ZONE AT AN ELEVATED TEMPERATURE OF ABOUT 400* TO 900* F. WITH A CATALYST COMPRISING A CRYSTALLINE HYDROGEN ALUMINO-SILICATE, AND RECOVERING FROM THE REACTION ZONE EFFUENT A MIXTURE OF THREE XYLENE ISOMERS.
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) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |