US2747686A
Expired / Lapsed
US
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Assignee: United Coke and Chemical Co
•
Filing: 1952-12-08
•
Granted: 1956-05-29
•
Expires: 1972-12-08
Abstract
No abstract record available.
Inventors
- 👤 Harry L Riley
- 👤 Norris John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:01
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/24; B01D46/2403; B01D46/2407; B01D46/0002; B01D46/0005; B01D2265/00; B01D2265/02; B01D2265/028; B01D2265/06; B01D2275/00; B01D2275/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US232122A
Cited
US1229437A
Cited
US2137246A
Cited
US2350011A
Cited
US2429751A
Cited
US2459398A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-29 | 1959-11-28 | 1960-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-29 | 1963-11-28 | 1964-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-29 | 1967-11-28 | 1968-05-29 | $7700.00 | Window Closed / Lapsed |