Patent US2777508A successfully refreshed from Google Patents.
US2777508A
Expired / Lapsed
US
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Pilot burner for combustion heater
Assignee: Douglas Aircraft Co Inc
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Filing: 1952-04-26
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Granted: 1957-01-15
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Expires: 1972-04-26
Abstract
No abstract record available.
Inventors
- 👤 Peter L Jurisich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:04
CPC Classifications
F; F23; F23R; F23R3/00; F23R3/28; F23R3/34; F23R3/343
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1625630A
Cited
US1839880A
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US1841463A
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US2247977A
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US2518000A
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US2635424A
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US2632300A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-15 | 1960-07-16 | 1961-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-15 | 1964-07-16 | 1965-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-15 | 1968-07-16 | 1969-01-15 | $7700.00 | Window Closed / Lapsed |