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US2644512A
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Burner device having heat exchange and gas flow control means for maintaining pyrophoric ignition therein
Assignee: HEIZMOTOREN GES UBERLINGEN AM
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Filing: 1950-06-07
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Granted: 1953-07-07
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Expires: 1970-06-07
Abstract
No abstract record available.
Inventors
- 👤 Durr Walter
- 👤 Huber Ludwig
- 👤 Haag Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:14
CPC Classifications
F; F23; F23C; F23C15/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1381708A
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GB424955A
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US2117108A
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US2286854A
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US2424765A
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US2412825A
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US2526645A
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US2523308A
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US2523378A
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US2496351A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-06 | 1957-01-05 | 1957-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-06 | 1961-01-05 | 1961-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-06 | 1965-01-05 | 1965-07-07 | $7700.00 | Window Closed / Lapsed |