Patent US2438474A successfully refreshed from Google Patents.
US2438474A
Expired / Lapsed
US
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Multirange tuner for ultra high frequency transmitters
Assignee: Individual
•
Filing: 1943-12-29
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Granted: 1948-03-23
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Expires: 1963-12-29
Abstract
No abstract record available.
Inventors
- 👤 Dodds John Mathieson
- 👤 Ludlow John Heywood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:12
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/02; H04B1/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1394555A
Cited
US2085838A
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US1809932A
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US1986525A
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US1945525A
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US2078908A
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US2103035A
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US2113463A
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US2100402A
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US2186068A
Cited
US2278371A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-23 | 1951-09-22 | 1952-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-23 | 1955-09-22 | 1956-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-23 | 1959-09-22 | 1960-03-23 | $7700.00 | Window Closed / Lapsed |