US2578809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phonograph pickup
Assignee: Admiral Corp
•
Filing: 1948-01-07
•
Granted: 1951-12-18
•
Expires: 1968-01-07
Abstract
No abstract record available.
Inventors
- 👤 Arthur L Ketchum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:50
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/16; Y; Y10; Y10T; Y10T403/00; Y10T403/45; Y10T403/455
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB213019A
Cited
US1909995A
Cited
US2042606A
Cited
US2348526A
Cited
US2356027A
Cited
US2366860A
Cited
US2480272A
Cited
US2451221A
Cited
US2415403A
Cited
GB604077A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-17 | 1955-06-18 | 1955-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-17 | 1959-06-18 | 1959-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-17 | 1963-06-18 | 1963-12-18 | $7700.00 | Window Closed / Lapsed |