Patent US6336933B1 successfully refreshed from Google Patents.
US2449412A
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Tuning indicator for indicating resonance of an electric circuit
Assignee: Hartford National Bank and Trust Co
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Filing: 1947-02-08
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Granted: 1948-09-14
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Expires: 1967-02-08
Abstract
No abstract record available.
Inventors
- 👤 Rathenau Gerhard
- 👤 Kruithof Arie Andries
- 👤 Hartveld Joseph Andries
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:33
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/50; H01J17/52; H01J17/54; H01J17/56; H03; H03J; H03J1/00; H03J1/02; H03J1/04; H03J3/00; H03J3/02; H03J3/12; H03J3/14; H03J7/00; H03J7/18; H03J7/32
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) | 1951-09-14 | 1952-03-15 | 1952-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-14 | 1956-03-15 | 1956-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-14 | 1960-03-15 | 1960-09-14 | $7700.00 | Window Closed / Lapsed |