Patent US2436946A successfully refreshed from Google Patents.
US2436946A
Expired / Lapsed
US
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Capacity-type phonograph pickup
Assignee: VIRGIL A HAMILTON
•
Filing: 1941-04-10
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Granted: 1948-03-02
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Expires: 1961-04-10
Abstract
No abstract record available.
Inventors
- 👤 Frank B Tatro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:50
CPC Classifications
H; H04; H04R; H04R19/00; H04R19/04; H04R19/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1702438A
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US1557664A
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US1544001A
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US1754293A
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US1732393A
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US1689564A
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GB373973A
Cited
US1988609A
Cited
US2097874A
Cited
US2047653A
Cited
US2304633A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-02 | 1951-09-01 | 1952-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-02 | 1955-09-01 | 1956-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-02 | 1959-09-01 | 1960-03-02 | $7700.00 | Window Closed / Lapsed |