Patent US2898980A successfully refreshed from Google Patents.
US2898980A
Expired / Lapsed
US
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Conversion unit
Assignee: Individual
•
Filing: 1954-11-01
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Granted: 1959-08-11
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Expires: 1974-11-01
Abstract
No abstract record available.
Inventors
- 👤 Earl R O'cathey
- 👤 John L Doonan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:17
CPC Classifications
F; F23; F23D; F23D14/00; F23D14/34; F23D14/36; F23D11/00; F23D11/001
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1879992A
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US2095230A
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US2180789A
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US2263170A
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US2417981A
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US2549427A
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US2635813A
Cited
US2594562A
Cited
US2744568A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-10 | 1963-02-09 | 1963-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-10 | 1967-02-09 | 1967-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-10 | 1971-02-09 | 1971-08-11 | $7700.00 | Window Closed / Lapsed |