US2831535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel burner
Assignee: Peabody Engineering Corp
•
Filing: 1953-12-28
•
Granted: 1958-04-22
•
Expires: 1973-12-28
Abstract
No abstract record available.
Inventors
- 👤 William F Lange
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:30
CPC Classifications
F; F23; F23C; F23C5/00; F23C5/02; F23D; F23D17/00; F23D17/002; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19642; Y10T74/1967
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2699566A
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US2735528A
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US1164854A
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US1160806A
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US1671494A
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US1736627A
Cited
US2342597A
Cited
US2540416A
Cited
GB631204A
Cited
US2537947A
Cited
US2631466A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |