US2544742A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cubic loud-speaker cabinet
Assignee: VIBRA SONIC Inc
•
Filing: 1946-12-31
•
Granted: 1951-03-13
•
Expires: 1966-12-31
Abstract
No abstract record available.
Inventors
- 👤 Christian A Volf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:22
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/32; H04R1/40; H04R1/403
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1754928A
Cited
US1932343A
Cited
GB479549A
Cited
GB486095A
Cited
GB486038A
Cited
GB492098A
Cited
US2206427A
Cited
US2206012A
Cited
US2337213A
Cited
US2373692A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-12 | 1954-09-11 | 1955-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-12 | 1958-09-11 | 1959-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-12 | 1962-09-11 | 1963-03-13 | $7700.00 | Window Closed / Lapsed |