US2643728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High fidelity loud-speaker cabinet
Assignee: Individual
•
Filing: 1951-08-15
•
Granted: 1953-06-30
•
Expires: 1971-08-15
Abstract
No abstract record available.
Inventors
- 👤 William R Anthony
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:37
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1865735A
Cited
US1969704A
Cited
GB434563A
Cited
US1985881A
Cited
FR802837A
Cited
AT153119B
Cited
US2224919A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-29 | 1956-12-29 | 1957-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-29 | 1960-12-29 | 1961-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-29 | 1964-12-29 | 1965-06-30 | $7700.00 | Window Closed / Lapsed |