Patent US2479561A successfully refreshed from Google Patents.
US2479561A
Expired / Lapsed
US
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Coal activator
Assignee: Individual
•
Filing: 1945-12-29
•
Granted: 1949-08-23
•
Expires: 1965-12-29
Abstract
No abstract record available.
Inventors
- 👤 Elkan Fred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:27
CPC Classifications
C; C10; C10L; C10L9/00; C10L9/10; C10L5/00; C10L5/02; C10L5/06; C10L5/10; C10L5/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US301243A
Cited
US505311A
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US522666A
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US524488A
Cited
US540609A
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US678346A
Cited
US2186667A
Cited
US2227256A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-08-22 | 1953-02-21 | 1953-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-22 | 1957-02-21 | 1957-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-22 | 1961-02-21 | 1961-08-23 | $7700.00 | Window Closed / Lapsed |