Patent US2544340A successfully refreshed from Google Patents.
US2544340A
Expired / Lapsed
US
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Volume controlling amplifier
Assignee: General Electric Co
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Filing: 1946-05-23
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Granted: 1951-03-06
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Expires: 1966-05-23
Abstract
No abstract record available.
Inventors
- 👤 Donald E Maxwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:55
CPC Classifications
H; H03; H03G; H03G7/00; H03G7/02; H03G7/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2069809A
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US2323634A
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US2259860A
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US2261335A
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US2282383A
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US2261356A
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US2335612A
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US2331708A
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US2369066A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-05 | 1954-09-04 | 1955-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-05 | 1958-09-04 | 1959-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-05 | 1962-09-04 | 1963-03-06 | $7700.00 | Window Closed / Lapsed |