US3475511A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Butene-2 isomerization
Assignee: Texas Petrochemicals Corp
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Filing: 1967-10-02
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Granted: 1969-10-28
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Expires: 1987-10-02
Abstract
No abstract record available.
Inventors
- 👤 Harold E Manning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:30
CPC Classifications
C; C07; C07C; C07C11/00; C07C11/02; C07C11/08; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/061; C07C5/00; C07C5/22; C07C5/23; C07C5/25; C07C5/2506; C07C5/2518
Claims Analysis
Total Claims: 0
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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) | 1972-10-27 | 1973-04-28 | 1973-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-27 | 1977-04-28 | 1977-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-27 | 1981-04-28 | 1981-10-28 | $7700.00 | Window Closed / Lapsed |