Patent US2373540A successfully refreshed from Google Patents.
US2569887A
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US
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Combustion apparatus, including flame type ignition means
Assignee: DANIEL AND FLORENCE GUGGENHEIM
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Filing: 1945-12-19
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Granted: 1951-10-02
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Expires: 1965-12-19
Abstract
No abstract record available.
Inventors
- 👤 Esther C Goddard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:39
CPC Classifications
F; F02; F02K; F02K9/00; F02K9/95; F02K9/42; F02K9/44; F02K9/52; F02K9/60; F02K9/62; Y; Y10; Y10S; Y10S60/00; Y10S60/915
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2016921A
Cited
US1879186A
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US2061873A
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FR735757A
Cited
US2279546A
Cited
US2117108A
Cited
US2090039A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-01 | 1955-04-02 | 1955-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-01 | 1959-04-02 | 1959-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-01 | 1963-04-02 | 1963-10-02 | $7700.00 | Window Closed / Lapsed |