US2551466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spark recording apparatus
Assignee: HENRY LEPAUTE ETS
•
Filing: 1946-12-10
•
Granted: 1951-05-01
•
Expires: 1966-12-10
Abstract
No abstract record available.
Inventors
- 👤 Salmon-Legagneur Pierre
- 👤 Mauny Gerard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:12
CPC Classifications
G; G04; G04D; G04D7/00; G04D7/12; G04D7/1207; G04D7/1214; G04D7/1221
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US907235A
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US2477062A
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US2303472A
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US2340880A
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US2485730A
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US2469940A
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US2437242A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-30 | 1954-10-30 | 1955-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-30 | 1958-10-30 | 1959-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-30 | 1962-10-30 | 1963-05-01 | $7700.00 | Window Closed / Lapsed |