Patent US3239433A successfully refreshed from Google Patents.
US3239433A
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Addition of oxygen during methylvinyl-pyridine distillation to prevent polymerization
Assignee: Phillips Petroleum Co
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Filing: 1962-05-31
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Granted: 1966-03-08
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Expires: 1982-05-31
Abstract
No abstract record available.
Inventors
- 👤 John J Costolow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:50
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/06; C08; C08F; C08F2/00; C08F2/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
IN A PROCESS FOR RECOVERY OF METHYLVINYLPYRIDINE FROM A MIXTURE CONTAINING METHYLVINYLPYRIDINE AND SOLUBLE METHYLVINYLPYRIDINE POLYMER WHEREIN SAID MIXTURE IS SUBJECTED TO DISTILLATION TO PRODUCE A METHYLVINYLPYRIDINE OVERHEAD PRODUCT AND A KETTLE PRODUCT CONTAINING SOLUBLE METHYLVINYLPYRIDINE POLYMER, AND WHEREIN A PORTION OF THE METHYLVINYLPYRIDINE SUBJECTED TO DISTILLATION IS CON-
Claim 2
Dependent Claim
49 words
IN A PROCESS FOR RECOVERY OF METHYLVINYLPYRIDINE FROM A MIXTURE CONTAINING METHYLVINYLPYRIDINE AND SOLUBLE METHYLVINYLPYRIDINE POLYMER WHEREIN SAID MIXTURE IS SUBJECTED TO DISTILLATION TO PRODUCE A METHYLVINYLPYRIDINE OVERHEAD PRODUCT AND A KETTLE PRODUCT CONTAINING SOLUBLE METHYLVINYLPYRIDINE POLYMER, AND WHEREIN A PORTION OF THE METHYLVINYLPYRIDINE SUBJECTED TO DISTILLATION IS CON-
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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) | 1969-03-07 | 1969-09-06 | 1970-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-07 | 1973-09-06 | 1974-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-07 | 1977-09-06 | 1978-03-08 | $7700.00 | Window Closed / Lapsed |