US2438477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tuning circuit for radio transmitters
Assignee: Individual
•
Filing: 1943-12-29
•
Granted: 1948-03-23
•
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
2026-10-25 16:41
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/02; H04B1/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR564836A
Cited
US1740131A
Cited
US2085838A
Cited
US1960058A
Cited
US2120518A
Cited
US2277638A
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 |