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Patent US2558850A successfully refreshed from Google Patents.
US2558850A
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US
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Vertical velocity control for aircraft
Assignee: NORDEN LAB CORP
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Filing: 1946-07-22
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Granted: 1951-07-03
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Expires: 1966-07-22
Abstract
No abstract record available.
Inventors
- 👤 Hofstadter Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:34
CPC Classifications
G; G05; G05D; G05D1/00; G05D1/04; G05D1/06; G05D1/0607
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2025218A
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US2020275A
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US2204290A
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US2276816A
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US2350024A
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US2415429A
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US2450907A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-02 | 1955-01-01 | 1955-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-02 | 1959-01-01 | 1959-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-02 | 1963-01-01 | 1963-07-03 | $7700.00 | Window Closed / Lapsed |