US2797766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Louid speaker
Assignee: David Bogen & Co Inc
•
Filing: 1953-10-20
•
Granted: 1957-07-02
•
Expires: 1973-10-20
Abstract
No abstract record available.
Inventors
- 👤 Herbert W Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:08
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/30; H04R1/28; H04R1/2869; H04R1/2876; H04R1/288; H04R1/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1748407A
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US1755552A
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US1730531A
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US2115129A
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US2200297A
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US2231791A
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US2277525A
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US2338262A
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US2640556A
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US2604182A
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US2665459A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-01 | 1960-12-31 | 1961-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-01 | 1964-12-31 | 1965-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-01 | 1968-12-31 | 1969-07-02 | $7700.00 | Window Closed / Lapsed |