US3168583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective deethylation process
Assignee: Sinclair Research Inc
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Filing: 1961-12-15
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Granted: 1965-02-02
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Expires: 1981-12-15
Abstract
No abstract record available.
Inventors
- 👤 Stephen M Kovach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:32
CPC Classifications
C; C07; C07C; C07C4/00; C07C4/08; C07C4/12; C07C4/14; C07C4/18; C07C2521/00; C07C2521/02; C07C2521/04; C07C2523/00; C07C2523/16; C07C2523/24; C07C2523/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A PROCESS FOR SELECTIVELY CRACKING A POLYMETHYLBENZENE FEEDSTOCK CONSISTING ESSENTIALLY OF POLYMETHYLBENZENE CONTAINING 2 TO 5 METHYL GROUPS ON THE BENZENE RING, WHICH METHYL GROUPS ARE THE ONLY ALKYL SUBSTITUENTS, AND ABOUT 10 TO 50% BY WEIGHT OF ETHYL-SUBSTITUTED BENZENES TO REDUCE THE ETHYL-SUBSTITUTED BENZENE CONTENT OF THE FEEDSTOCK WHICH PROCESS CONSISTS ESSENTIALLY IN CONTACTING SAID FEEDSTOCK WITH A CATALYST CONSISTING ESSENTIALLY OF CHROMIA AND BORIA ON ALUMINA, IN THE PRESENCE OF HYDROGEN AT A TEMPERATURE OF ABOUT 400 TO 1100*F.
Claim 2
Dependent Claim
81 words
A PROCESS FOR SELECTIVELY CRACKING A POLYMETHYLBENZENE FEEDSTOCK CONSISTING ESSENTIALLY OF POLYMETHYLBENZENE CONTAINING 2 TO 5 METHYL GROUPS ON THE BENZENE RING, WHICH METHYL GROUPS ARE THE ONLY ALKYL SUBSTITUENTS, AND ABOUT 10 TO 50% BY WEIGHT OF ETHYL-SUBSTITUTED BENZENES TO REDUCE THE ETHYL-SUBSTITUTED BENZENE CONTENT OF THE FEEDSTOCK WHICH PROCESS CONSISTS ESSENTIALLY IN CONTACTING SAID FEEDSTOCK WITH A CATALYST CONSISTING ESSENTIALLY OF CHROMIA AND BORIA ON ALUMINA, IN THE PRESENCE OF HYDROGEN AT A TEMPERATURE OF ABOUT 400 TO 1100*F.
References Cited (Backward Citations)
US2776326A
Cited
US3033777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-02-02 | 1968-08-03 | 1969-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-02 | 1972-08-03 | 1973-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-02 | 1976-08-03 | 1977-02-02 | $7700.00 | Window Closed / Lapsed |