Patent US2620439A successfully refreshed from Google Patents.
US2620439A
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Noise balancing circuits
Assignee: General Electric Co
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Filing: 1947-11-05
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Granted: 1952-12-02
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Expires: 1967-11-05
Abstract
No abstract record available.
Inventors
- 👤 Robert B Dome
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:16
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/10; H04B1/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB190904125A
Cited
US1559743A
Cited
US2176218A
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US2121103A
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US2227415A
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US2204954A
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US2290517A
Cited
GB552807A
Cited
US2361625A
Cited
US2362806A
Cited
US2497103A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-02 | 1956-06-02 | 1956-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-02 | 1960-06-02 | 1960-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-02 | 1964-06-02 | 1964-12-02 | $7700.00 | Window Closed / Lapsed |