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US3494858A
Expired / Lapsed
US
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Two-stage countercurrent catalyst regenerator
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1967-11-17
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Granted: 1970-02-10
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Expires: 1987-11-17
Abstract
No abstract record available.
Inventors
- 👤 Edward C Luckenbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:26
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/26; B01J8/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2414002A
Cited
US2788311A
Cited
US2959537A
Cited
US3213014A
Cited
US3161583A
Cited
US3294675A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-09 | 1973-08-11 | 1974-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-09 | 1977-08-11 | 1978-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-09 | 1981-08-11 | 1982-02-10 | $7700.00 | Window Closed / Lapsed |