Patent US3761536A successfully refreshed from Google Patents.
US3761536A
Expired / Lapsed
US
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Process for coupling propylene and isobutylene
Assignee: Gulf Research and Development Co
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Filing: 1971-12-16
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Granted: 1973-09-25
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Expires: 1991-12-16
Abstract
Abstract Propylene and isobutylene are oxydehydrodimerized at elevated temperatures in a continuous, non-cyclic process using a molar ratio of olefin to oxygen of about 1:2 to 2:1 in the presence of bismuth oxide.
Inventors
- 👤 H Swift
- 👤 J Bozik
- 👤 J Ondrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:36
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/76; C07C2/82; C07C2/84; C07C2523/00; C07C2523/16; C07C2523/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
18 words
The method in accordance with claim 1 in which the olefin is propylene and the product is 1,5-hexadiene.
Claim 2
Dependent Claim
18 words
The method in accordance with claim 1 in which the olefin is isobutylene and the product is 2,5-dimethyl-1,5-hexadiene.
Claim 3
Dependent Claim
20 words
The method in accordance with claim 1 in which the temperature is between about 525* C. and about 625* C.
Claim 4
Dependent Claim
27 words
The method in accordance with claim 1 in which the catalyst is on a support having a surface area of between about 0.05 and about 1 M2/g.
Claim 5
Dependent Claim
19 words
The method in accordance with claim 1 in which the temperature is between about 550* C. and 600* C.
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |