US2564488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkylation of toluene by propylene catalyzed by acid activated montmorillonite clay
Assignee: Phillips Petroleum Co
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Filing: 1948-12-17
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Granted: 1951-08-14
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Expires: 1968-12-17
Abstract
No abstract record available.
Inventors
- 👤 John E Mahan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:36
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/54; C07C2/64; C07C2/66; C07C2521/00; C07C2521/16
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
71 words
AN IMPROVED PROCESS FOR THE PREPARATION OF META- AND PARA-, BUT VERY MINOR PROPORTIONS OF ORTHO-SUBSTITUTED ALKYLATEXC TOLUENE WHICH COMPRISES ALKYLATING TOLUENE WITH AN OLEFIN AT A TEMPERATURE BETWEEN 375* AND 700* F. AND ELEVATED PRESSURE IN THE PRESENCE OF ACID-ACTIVATED MONTMORILLONITE SUB-BENTONITE CATALYST SO AS TO PRODUCE A MIXTURE OF META- AND PARA- SUBSTITUTED ALKYLATED TOLUENE CONTAINING ONLY A VERY MINOR PROPORTION OF THE ORTHO-ISOMER AND RECOVERING THE RESULTING MIXTURE.
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) | 1954-08-13 | 1955-02-12 | 1955-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-13 | 1959-02-12 | 1959-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-13 | 1963-02-12 | 1963-08-14 | $7700.00 | Window Closed / Lapsed |