Patent US2426705A successfully refreshed from Google Patents.
US2426705A
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Recovery of isoprene by fractionation and extractive distillation
Assignee: Standard Oil Development Co
•
Filing: 1942-12-29
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Granted: 1947-09-02
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Expires: 1962-12-29
Abstract
No abstract record available.
Inventors
- 👤 John A Patterson
- 👤 Harold W Scheeline
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:07
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/005; C07C7/04; C07C7/05; C07C7/08
Claims Analysis
Total Claims: 0
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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) | 1950-09-01 | 1951-03-03 | 1951-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-09-01 | 1955-03-03 | 1955-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-09-01 | 1959-03-03 | 1959-09-02 | $7700.00 | Window Closed / Lapsed |