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US2602860A
Expired / Lapsed
US
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Loud-speaker structure
Assignee: Individual
•
Filing: 1947-11-18
•
Granted: 1952-07-08
•
Expires: 1967-11-18
Abstract
No abstract record available.
Inventors
- 👤 Doubt Leon Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:39
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/227
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1768226A
Cited
US1849486A
Cited
US1872799A
Cited
US1932343A
Cited
US1915954A
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US2160112A
Cited
GB492098A
Cited
US2122010A
Cited
US2143175A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-08 | 1956-01-07 | 1956-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-08 | 1960-01-07 | 1960-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-08 | 1964-01-07 | 1964-07-08 | $7700.00 | Window Closed / Lapsed |