US2722990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loudspeaker assemblies
Assignee: Decca Record Co Ltd
•
Filing: 1950-11-07
•
Granted: 1955-11-08
•
Expires: 1970-11-07
Abstract
No abstract record available.
Inventors
- 👤 West Ralph Leighton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:03
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/28; H04R1/2807; H04R1/2861; H04R1/2865
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1770771A
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US1985881A
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US2050575A
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US2109431A
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US2310243A
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US2337213A
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US2539327A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-11-07 | 1959-05-09 | 1959-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-07 | 1963-05-09 | 1963-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-07 | 1967-05-09 | 1967-11-08 | $7700.00 | Window Closed / Lapsed |