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US2963660A
Expired / Lapsed
US
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Signal frequency converter
Assignee: Northrop Grumman Corp
•
Filing: 1957-07-12
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Granted: 1960-12-06
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Expires: 1977-07-12
Abstract
No abstract record available.
Inventors
- 👤 George H Towner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:08
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/14; G05D3/1418; H; H02; H02M; H02M11/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2244799A
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US2304135A
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US2486076A
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US2608650A
Cited
US2446188A
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US2799829A
Cited
GB2357499A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-06 | 1964-06-06 | 1964-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-06 | 1968-06-06 | 1968-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-06 | 1972-06-06 | 1972-12-06 | $7700.00 | Window Closed / Lapsed |