Patent US2780654A successfully refreshed from Google Patents.
US2780654A
Expired / Lapsed
US
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Air oxidation of isobutylene
Assignee: Escambia Chemical Corp
•
Filing: 1952-10-22
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Granted: 1957-02-05
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Expires: 1972-10-22
Abstract
No abstract record available.
Inventors
- 👤 Nat C Robertson
- 👤 James H Gardner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:40
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/48; C07C29/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1875312A
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US2071395A
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US2265948A
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US2316604A
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US2437648A
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US2475605A
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US2434888A
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US2500599A
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US2644837A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-05 | 1960-08-06 | 1961-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-05 | 1964-08-06 | 1965-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-05 | 1968-08-06 | 1969-02-05 | $7700.00 | Window Closed / Lapsed |