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 12:11
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)
US424617A
Cited
GB190400942A
Cited
US926194A
Cited
US1001997A
Cited
US1612532A
Cited
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 |