Patent US2970308A successfully refreshed from Google Patents.
US2970308A
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US
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Parallel digital to a. c. analog converter
Assignee: General Dynamics Corp
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Filing: 1957-08-07
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Granted: 1961-01-31
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Expires: 1977-08-07
Abstract
No abstract record available.
Inventors
- 👤 George S Stringfellow
- 👤 Erwin J Emkjer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:01
CPC Classifications
H; H01; H01F; H01F29/00; H01F29/02; H01F29/04; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/12; H02M7/145; H02M7/155; H02M7/19; H03; H03M; H03M1/00; H03M1/66; H03M1/74; H03M1/742; H03M1/747
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2570221A
Cited
GB731650A
Cited
US2738504A
Cited
US2891171A
Cited
US2827233A
Cited
US2817078A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-31 | 1964-08-01 | 1965-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-31 | 1968-08-01 | 1969-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-31 | 1972-08-01 | 1973-01-31 | $7700.00 | Window Closed / Lapsed |