US3479416A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of isobutylene from isobutane
Assignee: Texas Petrochemicals Corp
•
Filing: 1967-05-19
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Granted: 1969-11-18
•
Expires: 1987-05-19
Abstract
No abstract record available.
Inventors
- 👤 Lloyd D Tschopp
- 👤 Rudolph C Woerner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:36
CPC Classifications
C; C07; C07C; C07C11/00; C07C11/02; C07C11/08; C07C11/09; C07C7/00; C07C7/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2956092A
Cited
US3235471A
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US3320138A
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US3317627A
Cited
US3293316A
Cited
US3293319A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-17 | 1973-05-19 | 1973-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-17 | 1977-05-19 | 1977-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-17 | 1981-05-19 | 1981-11-18 | $7700.00 | Window Closed / Lapsed |