Patent US3038964A successfully refreshed from Google Patents.
US3038964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loudspeaker system
Assignee: Individual
•
Filing: 1956-12-18
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Granted: 1962-06-12
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Expires: 1976-12-18
Abstract
No abstract record available.
Inventors
- 👤 Amar G Bose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:44
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/32; H04R1/40; H04R1/403; H04R1/22; H04R1/227
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1397575A
Cited
US1478078A
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US1914629A
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US1984450A
Cited
US2065344A
Cited
US2354537A
Cited
US2602860A
Cited
US2632055A
Cited
US2605355A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-06-11 | 1965-12-11 | 1966-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-11 | 1969-12-11 | 1970-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-11 | 1973-12-11 | 1974-06-12 | $7700.00 | Window Closed / Lapsed |