Patent US2808688A successfully refreshed from Google Patents.
Patent US2516504A successfully refreshed from Google Patents.
US2516504A
Expired / Lapsed
US
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Safety control and pilot indicator
Assignee: —
•
Filing: —
•
Granted: 1950-07-25
•
Expires: 1967-07-25
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:35
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/20; F23N5/203; F23N5/206; F23N5/24; F23N5/242; F23Q; F23Q9/00; F24; F24C; F24C3/00; F24C3/10; F24C3/103; F23N2227/00; F23N2227/02; F23N2227/22; F23N2227/28; F23N2229/00; F23N2231/00; F23N2231/06; F23N2231/10; F23N2235/00; F23N2235/12; F23N2235/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1575170A
Cited
US2078576A
Cited
US2077297A
Cited
US2192632A
Cited
US2238892A
Cited
US2238890A
Cited
US2200908A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-24 | 1954-01-23 | 1954-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-24 | 1958-01-23 | 1958-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-24 | 1962-01-23 | 1962-07-25 | $7700.00 | Window Closed / Lapsed |