US2419907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for reducing impedance effects in grounded communication circuits
Assignee: Siemens Brothers and Co Ltd
•
Filing: 1941-09-02
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Granted: 1947-04-29
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Expires: 1961-09-02
Abstract
No abstract record available.
Inventors
- 👤 Mole John Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:55
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/01; H03H7/0123
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2097491A
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US1964048A
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US1994905A
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US1985042A
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DE603627C
Cited
US2176211A
Cited
US2204721A
Cited
US2158875A
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US2280950A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-04-28 | 1950-10-28 | 1951-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-04-28 | 1954-10-28 | 1955-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-04-28 | 1958-10-28 | 1959-04-29 | $7700.00 | Window Closed / Lapsed |