US2676308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for deriving phase-shifted voltages from an input voltage of varying frequency
Assignee: Hartford National Bank and Trust Co
•
Filing: 1948-11-16
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Granted: 1954-04-20
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Expires: 1968-11-16
Abstract
No abstract record available.
Inventors
- 👤 Vos Jacobus Nicolaas
- 👤 Tellegen Bernardus Do Hubertus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:34
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/18; H03H7/21; H03C; H03C1/00; H03C1/52; H03C1/60; H03H11/00; H03H11/02; H03H11/16; H03H11/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2153857A
Cited
US2248239A
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GB532186A
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US2248250A
Cited
US2392476A
Cited
US2529117A
Cited
US2511606A
Cited
US2566876A
Cited
US2442097A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-19 | 1957-10-19 | 1958-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-19 | 1961-10-19 | 1962-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-19 | 1965-10-19 | 1966-04-20 | $7700.00 | Window Closed / Lapsed |