Patent US2109158A successfully refreshed from Google Patents.
Patent US2470893A successfully refreshed from Google Patents.
US2470893A
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Circuit arrangement for modulating an electric signal
Assignee: Hartford National Bank and Trust Co
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Filing: 1947-05-03
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Granted: 1949-05-24
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Expires: 1967-05-03
Abstract
No abstract record available.
Inventors
- 👤 Hepp Gerard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:16
CPC Classifications
H; H03; H03F; H03F11/00; G; G01; G01R; G01R27/00; G01R27/02; G01R27/26; G01R27/2688; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1218; H01G4/1227; H03C; H03C1/00; H03C1/08; H03C1/12; H03C5/00; H03D; H03D7/00; H03F3/00; H03F3/38; H03F3/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1884591A
Cited
US2182377A
Cited
US2220098A
Cited
US2243921A
Cited
GB522132A
Cited
US2298466A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-23 | 1952-11-22 | 1953-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-23 | 1956-11-22 | 1957-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-23 | 1960-11-22 | 1961-05-24 | $7700.00 | Window Closed / Lapsed |