Patent US2553575A successfully refreshed from Google Patents.
US2553575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety pilot controlled
Assignee: —
•
Filing: —
•
Granted: 1951-05-22
•
Expires: 1968-05-22
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:18
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/01; G05D23/02; F; F23; F23N; F23N5/00; F23N5/02; F23N5/027
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US926194A
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US1001997A
Cited
US1612532A
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US1773698A
Cited
US1683213A
Cited
US1757591A
Cited
US1842335A
Cited
US2008400A
Cited
US2302407A
Cited
US2303128A
Cited
US2422368A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-21 | 1954-11-20 | 1955-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-21 | 1958-11-20 | 1959-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-21 | 1962-11-20 | 1963-05-22 | $7700.00 | Window Closed / Lapsed |