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Patent US3448012A successfully refreshed from Google Patents.
US3448012A
Expired / Lapsed
US
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Rotary concentric partition in a coke oven hearth
Assignee: Marathon Oil Co
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Filing: 1967-02-01
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Granted: 1969-06-03
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Expires: 1987-02-01
Abstract
No abstract record available.
Inventors
- 👤 Victor D Allred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:15
CPC Classifications
C; C10; C10L; C10L9/00; C10L9/08; C10B; C10B49/00; C10B49/02; C10B49/04; C10B7/00; C10B7/02
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) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |