US2561417A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impedance matched frequency converter
Assignee: Individual
•
Filing: 1945-05-31
•
Granted: 1951-07-24
•
Expires: 1965-05-31
Abstract
No abstract record available.
Inventors
- 👤 Alden H Ryan
- 👤 John P Hagen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:40
CPC Classifications
H; H03; H03D; H03D9/00; H03D9/06; H03D9/0608; H03D9/0616
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2142159A
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US2177272A
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US2236004A
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US2433386A
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US2455657A
Cited
US2436830A
Cited
US2469222A
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US2433387A
Cited
US2408420A
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US2423416A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-23 | 1955-01-22 | 1955-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-23 | 1959-01-22 | 1959-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-23 | 1963-01-22 | 1963-07-24 | $7700.00 | Window Closed / Lapsed |