Patent US2555906A successfully refreshed from Google Patents.
US2555906A
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US
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Tunable amplifier having a predetermined band-pass characteristic throughout its range
Assignee: Hartford National Bank and Trust Co
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Filing: 1946-07-15
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Granted: 1951-06-05
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Expires: 1966-07-15
Abstract
No abstract record available.
Inventors
- 👤 Carel Jan Van Loon
- 👤 Tellegen Bernardus Do Hubertus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:04
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/02; H01J25/10; H01J19/00; H01J19/82; H01J25/12; H01J43/00; H01J43/02; H01J43/025; H03; H03D; H03D7/00; H03D7/06; H03D7/10; H03F; H03F1/00; H03F1/08; H03F1/26; H03F1/28; H03F1/34; H03F1/36; H03F3/00; H03F3/50; H03F3/52; H03G; H03G3/00; H03G3/20; H03G3/22; H03G5/00; H03G5/02; H03G5/04; H03G5/06; H03J; H03J3/00; H03J3/02; H03J3/06; H04; H04B; H04B15/00; H04B15/02; H04B15/04; H04B15/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-04 | 1954-12-04 | 1955-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-04 | 1958-12-04 | 1959-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-04 | 1962-12-04 | 1963-06-05 | $7700.00 | Window Closed / Lapsed |