US2497191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isobutylene production
Assignee: Standard Oil Development Co
•
Filing: 1946-12-20
•
Granted: 1950-02-14
•
Expires: 1966-12-20
Abstract
No abstract record available.
Inventors
- 👤 Clellie T Steele
- 👤 Jr Ernest A Epps
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:30
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/17; C07C7/171
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A PROCESS FOR THE PRODUCTION OF SUBSTANTIALLY PURE ISOBUTYLENE FROM AN ISOBUTYLENE FRACTION CONTAINING ISOMERIC BUTENE-1 AND BUTENES-2 WHICH ARE DIFFICULT TO REMOVE THEREFROM WHICH COMPRISES CONTACTING THE ISOBUTYLENE FRACTION WITH SULFURIC ACID OF 55-70 WT. PER CENT CONCENTRATION TO FORM AN ISOBUTYLENE-SULFURIC ACID EXTRACT CONTAMINATED WITH PHYSICALLY DISSOLVED AND MECHANICALLY ENTRAINED ISOMERIC BUTENE-1 AND BUTENES-2, STRIPPING THE CONTAMINATED EXTRACT WITH AN ISOBUTYLENE FRACTION SUBSTANTIALLY FREE OF BUTENE-1 WHEREBY THE PHYSICALLY DISSOLVED AND MECHANICALLY ENTRAINED ISOMERIC BUTENE-1 AND BUTENES-2 ARE REMOVED FROM THE EXTRACT, AND THEREAFTER STRIPPING THE PURIFIED EXTRACT WITH STEAM TO RECOVER THEREFROM ISOBUTYLENE SUBSTANTIALLY FREE OF ISOMERIC BUTENE-1 AND BUTENES-2.
Claim 2
Dependent Claim
103 words
A PROCESS FOR THE PRODUCTION OF SUBSTANTIALLY PURE ISOBUTYLENE FROM AN ISOBUTYLENE FRACTION CONTAINING ISOMERIC BUTENE-1 AND BUTENES-2 WHICH ARE DIFFICULT TO REMOVE THEREFROM WHICH COMPRISES CONTACTING THE ISOBUTYLENE FRACTION WITH SULFURIC ACID OF 55-70 WT. PER CENT CONCENTRATION TO FORM AN ISOBUTYLENE-SULFURIC ACID EXTRACT CONTAMINATED WITH PHYSICALLY DISSOLVED AND MECHANICALLY ENTRAINED ISOMERIC BUTENE-1 AND BUTENES-2, STRIPPING THE CONTAMINATED EXTRACT WITH AN ISOBUTYLENE FRACTION SUBSTANTIALLY FREE OF BUTENE-1 WHEREBY THE PHYSICALLY DISSOLVED AND MECHANICALLY ENTRAINED ISOMERIC BUTENE-1 AND BUTENES-2 ARE REMOVED FROM THE EXTRACT, AND THEREAFTER STRIPPING THE PURIFIED EXTRACT WITH STEAM TO RECOVER THEREFROM ISOBUTYLENE SUBSTANTIALLY FREE OF ISOMERIC BUTENE-1 AND BUTENES-2.
References Cited (Backward Citations)
US2012785A
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US2144692A
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US2180386A
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US2380350A
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US2400340A
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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) | 1953-02-13 | 1953-08-15 | 1954-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-13 | 1957-08-15 | 1958-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-13 | 1961-08-15 | 1962-02-14 | $7700.00 | Window Closed / Lapsed |