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Patent US2880817A successfully refreshed from Google Patents.
US2880817A
Expired / Lapsed
US
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Loudspeaker system
Assignee: Pickard & Burns Inc
•
Filing: 1953-10-28
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Granted: 1959-04-07
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Expires: 1973-10-28
Abstract
No abstract record available.
Inventors
- 👤 Harold S Burns
- 👤 Mars Paul A De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:59
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/28; H04R1/2807; H04R1/2811; H04R1/2815; H04R1/2819
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1901388A
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US1969704A
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FR784836A
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US2031500A
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US2097289A
Cited
FR789279A
Cited
US2065751A
Cited
US2670053A
Cited
FR1025702A
Cited
US2643728A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-06 | 1962-10-06 | 1963-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-06 | 1966-10-06 | 1967-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-06 | 1970-10-06 | 1971-04-07 | $7700.00 | Window Closed / Lapsed |