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US2485948A
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Low-frequency converter-amplifier system
Assignee: Leeds and Northrup Co
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Filing: 1947-01-31
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Granted: 1949-10-25
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Expires: 1967-01-31
Abstract
No abstract record available.
Inventors
- 👤 Jr Albert J Williams
- 👤 Raymond E Tarpley
- 👤 Norma C Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:11
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/38; H03F3/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1557229A
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US2176447A
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US2141369A
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US2096962A
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US2221105A
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US2229373A
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US2297659A
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US2353429A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-10-24 | 1953-04-25 | 1953-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-10-24 | 1957-04-25 | 1957-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-10-24 | 1961-04-25 | 1961-10-25 | $7700.00 | Window Closed / Lapsed |