US2982372A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loud speaker baffle having improved low frequency reproduction characteristics
Assignee: Individual
•
Filing: 1957-05-16
•
Granted: 1961-05-02
•
Expires: 1977-05-16
Abstract
No abstract record available.
Inventors
- 👤 Benjamin W Lowell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:47
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/28; H04R1/2869; H04R1/2884; H04R1/2888; H04R1/02; H04R1/021; H04R1/2803; H04R2201/00; H04R2201/02; H04R2201/021
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1887185A
Cited
US1869178A
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US1930577A
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US2083753A
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US2096192A
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US2563948A
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US2821260A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-01 | 1964-10-31 | 1965-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-01 | 1968-10-31 | 1969-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-01 | 1972-10-31 | 1973-05-02 | $7700.00 | Window Closed / Lapsed |