Patent US2528575A successfully refreshed from Google Patents.
US2528575A
Expired / Lapsed
US
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Altitude responsive control device
Assignee: Individual
•
Filing: 1948-01-23
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Granted: 1950-11-07
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Expires: 1968-01-23
Abstract
No abstract record available.
Inventors
- 👤 John H Broadbent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:53
CPC Classifications
G; G05; G05D; G05D1/00; G05D1/04; G05D1/042
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US662156A
Cited
US1694264A
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US2159142A
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US2369811A
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US2412263A
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US2387795A
Cited
US2440283A
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US2450930A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-06 | 1954-05-08 | 1954-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-06 | 1958-05-08 | 1958-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-06 | 1962-05-08 | 1962-11-07 | $7700.00 | Window Closed / Lapsed |