Patent US2500925A successfully refreshed from Google Patents.
US2500925A
Expired / Lapsed
US
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Apparatus for the combustion of fuel
Assignee: Individual
•
Filing: 1943-03-13
•
Granted: 1950-03-21
•
Expires: 1963-03-13
Abstract
No abstract record available.
Inventors
- 👤 Claude A Bonvillian
- 👤 Ralph C Brierly
- 👤 Letvin Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:50
CPC Classifications
F; F23; F23R; F23R3/00; F23R3/02; F23R3/04; F23R3/06; F23R3/08; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US710130A
Cited
GB190320604A
Cited
US972504A
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US974216A
Cited
US1082815A
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US1828784A
Cited
US1550007A
Cited
US2101270A
Cited
US2332866A
Cited
GB539069A
Cited
US2206553A
Cited
US2247296A
Cited
US2268464A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-20 | 1953-09-19 | 1954-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-20 | 1957-09-19 | 1958-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-20 | 1961-09-19 | 1962-03-21 | $7700.00 | Window Closed / Lapsed |