Patent US2457178A successfully refreshed from Google Patents.
US2457178A
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Resistance sine wave generator
Assignee: STC PLC
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Filing: 1943-12-06
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Granted: 1948-12-28
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Expires: 1963-12-06
Abstract
No abstract record available.
Inventors
- 👤 Avery G Richardson
- 👤 Trevor H Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:17
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US597002A
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US1003676A
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US1201687A
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US1244614A
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US1764347A
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US1944329A
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US2042334A
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US1992410A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-28 | 1952-06-28 | 1952-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-28 | 1956-06-28 | 1956-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-28 | 1960-06-28 | 1960-12-28 | $7700.00 | Window Closed / Lapsed |