Patent US2604551A successfully refreshed from Google Patents.
US2604551A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic unit with magnetically positioned pole piece for loudspeakers
Assignee: MAGNAVOX AUSTRALIA Pty Ltd
•
Filing: 1948-08-28
•
Granted: 1952-07-22
•
Expires: 1968-08-28
Abstract
No abstract record available.
Inventors
- 👤 Charlesworth Reginald Denison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:14
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/02; H04R9/025
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1905702A
Cited
US2090025A
Cited
US2295483A
Cited
US2429470A
Cited
US2501031A
Cited
US2501032A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-22 | 1956-01-21 | 1956-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-22 | 1960-01-21 | 1960-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-22 | 1964-01-21 | 1964-07-22 | $7700.00 | Window Closed / Lapsed |