Patent US1958678A successfully refreshed from Google Patents.
US2805022A
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Vector filter system
Assignee: North American Aviation Corp
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Filing: 1951-06-25
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Granted: 1957-09-03
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Expires: 1971-06-25
Abstract
No abstract record available.
Inventors
- 👤 Rulon G Shelley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:39
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/22; F; F41; F41G; F41G9/00; F41G9/002; G06G7/48; G06G7/78
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1436280A
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US2257757A
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US2493183A
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US2448564A
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US2492351A
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US2401421A
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US2437313A
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US2548278A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-02 | 1961-03-04 | 1961-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-02 | 1965-03-04 | 1965-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-02 | 1969-03-04 | 1969-09-03 | $7700.00 | Window Closed / Lapsed |