Patent US2649904A successfully refreshed from Google Patents.
US2649904A
Expired / Lapsed
US
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Main burner ignition system
Assignee: Geo D Roper Corp
•
Filing: 1949-07-19
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Granted: 1953-08-25
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Expires: 1969-07-19
Abstract
No abstract record available.
Inventors
- 👤 Peter I Hollman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:30
CPC Classifications
F; F24; F24C; F24C3/00; F24C3/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2490729A
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US2506403A
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US2098192A
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US2164887A
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US2221667A
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US2155339A
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US2260167A
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US2291805A
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US2443892A
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US2510264A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-24 | 1957-02-23 | 1957-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-24 | 1961-02-23 | 1961-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-24 | 1965-02-23 | 1965-08-25 | $7700.00 | Window Closed / Lapsed |