Patent US2588386A successfully refreshed from Google Patents.
US2436946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacity-type phonograph pickup
Assignee: VIRGIL A HAMILTON
•
Filing: 1941-04-10
•
Granted: 1948-03-02
•
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
2026-10-22 17:54
CPC Classifications
H; H04; H04R; H04R19/00; H04R19/04; H04R19/06
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1702438A
Cited
US1557664A
Cited
US1544001A
Cited
US1754293A
Cited
US1732393A
Cited
US1689564A
Cited
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 |