US2554696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic phonograph pickup head with two pairs of pole pieces
Assignee: Individual
•
Filing: 1947-05-26
•
Granted: 1951-05-29
•
Expires: 1967-05-26
Abstract
No abstract record available.
Inventors
- 👤 Henry H Bruderlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:28
CPC Classifications
H; H04; H04R; H04R11/00; H04R11/08
Claims Analysis
Total Claims: 0
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US2456388A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-28 | 1954-11-27 | 1955-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-28 | 1958-11-27 | 1959-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-28 | 1962-11-27 | 1963-05-29 | $7700.00 | Window Closed / Lapsed |