US2981767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Iso-olefin purification
Assignee: Petro Tex Chemical Corp
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Filing: 1958-09-29
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Granted: 1961-04-25
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Expires: 1978-09-29
Abstract
No abstract record available.
Inventors
- 👤 Richard J Gay
- 👤 Calvin M Tidwell
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
59 words
IN A PROCESS FOR SEPARATING ISOOLEFINS FROM A C4 HYDROCARBON STREAM WHICH COMPRISES EXTRACTING THE ISOOLEFIN FROM THE C4 HYDROCARBON STREAM WITH SULFURIC ACID AND REGENERATING ISOOLEFIN FROM THE SULFURIC ACID EXTRACT, THE IMPROVEMENT WHICH COMPRISES EXTRACTING THE ISOOLEFINCONTAINING SULFURIC ACID EXTRACT, PRIOR TO REGENERATION OF ISOOLEFINE, WITH AN UNSATURATED LIQUID OLEFIN POLYMER OF FROM 8 TO 16 ATOMS.
Claim 2
Dependent Claim
59 words
IN A PROCESS FOR SEPARATING ISOOLEFINS FROM A C4 HYDROCARBON STREAM WHICH COMPRISES EXTRACTING THE ISOOLEFIN FROM THE C4 HYDROCARBON STREAM WITH SULFURIC ACID AND REGENERATING ISOOLEFIN FROM THE SULFURIC ACID EXTRACT, THE IMPROVEMENT WHICH COMPRISES EXTRACTING THE ISOOLEFINCONTAINING SULFURIC ACID EXTRACT, PRIOR TO REGENERATION OF ISOOLEFINE, WITH AN UNSATURATED LIQUID OLEFIN POLYMER OF FROM 8 TO 16 ATOMS.
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) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |