Patent US2554054A successfully refreshed from Google Patents.
US2554054A
Expired / Lapsed
US
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Process for producing butadiene
Assignee: Phillips Petroleum Co
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Filing: 1949-01-04
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Granted: 1951-05-22
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Expires: 1969-01-04
Abstract
No abstract record available.
Inventors
- 👤 James R Owen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:10
CPC Classifications
C; C07; C07C; C07C11/00; C07C11/12; C07C11/16; C07C11/167
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
AN IMPROVED METHOD OF OBTAINING INCREASED YIELDS OF 1,3-BUTADIENE FROM A MIXTURE OF ISOMERIC NORMAL BUTENES, WHICH COMPRISES SEPARATING SAID MIXTURE INTO ITS COMPONENTS TO FORM A TRANS-2BUTENE CONCENTRATE, A CIS-2-BUTENE CONCENTRATE, AND A 1-BUTENE CONCENTRATE, SUBJECTING EACH OF SAID CONCENTRATES TO SEPARATE CATALYTIC DEHYDROGENATION TO FORM BUTADIENE, AND RECOVERING SAID
Claim 2
Dependent Claim
51 words
AN IMPROVED METHOD OF OBTAINING INCREASED YIELDS OF 1,3-BUTADIENE FROM A MIXTURE OF ISOMERIC NORMAL BUTENES, WHICH COMPRISES SEPARATING SAID MIXTURE INTO ITS COMPONENTS TO FORM A TRANS-2BUTENE CONCENTRATE, A CIS-2-BUTENE CONCENTRATE, AND A 1-BUTENE CONCENTRATE, SUBJECTING EACH OF SAID CONCENTRATES TO SEPARATE CATALYTIC DEHYDROGENATION TO FORM BUTADIENE, AND RECOVERING SAID
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) | 1954-05-21 | 1954-11-20 | 1955-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-21 | 1958-11-20 | 1959-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-21 | 1962-11-20 | 1963-05-22 | $7700.00 | Window Closed / Lapsed |