Patent US3644550A successfully refreshed from Google Patents.
US3644550A
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US
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Single stage cyclodimerization of paraffins to aromatic compounds
Assignee: Gulf Research and Development Co
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Filing: 1969-04-21
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Granted: 1972-02-22
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Expires: 1989-04-21
Abstract
Abstract A METHOD FOR THE SNGLE STAGE DIMERIZATION OF PARAFFINS AND MIXTURES OF PARAFFINS WHICH OLEFINS TO AROMATIC COMPOUNDS USING A MIXTURE OF CHROMIA-ALUMINA AND BISMUTH OXIDE. ISOBUTANE AND ISOBUTANE-ISOBUTENE MIXTURES ARE CONVERTED TO P-XYLENE.
Inventors
- 👤 Harold Beuther
- 👤 John A Ondrey
- 👤 Harold E Swift
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:24
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/76; C07C2/82; C07C2/84; B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; B01J23/31; C07C2521/00; C07C2521/02; C07C2521/04; C07C2523/00; C07C2523/16; C07C2523/18; C07C2523/24; C07C2523/26; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
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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) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |