US2604182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loud-speaker with a tapered horn coupled to the speaker diaphragm
Assignee: Individual
•
Filing: 1948-06-12
•
Granted: 1952-07-22
•
Expires: 1968-06-12
Abstract
No abstract record available.
Inventors
- 👤 Massa Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:59
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/28; H04R1/2807; H04R1/2838; H04R1/2842; H04R1/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1730425A
Cited
US1878018A
Cited
US1984542A
Cited
US2035108A
Cited
US2469773A
Cited
US2338262A
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 |