US3171904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrodynamic loud-speakers and microphones
Assignee: Individual
•
Filing: 1961-06-19
•
Granted: 1965-03-02
•
Expires: 1981-06-19
Abstract
No abstract record available.
Inventors
- 👤 Poutot Georges Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:58
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/06; H04R9/063; H04R9/02; H04R9/04; H04R9/046; H04R9/047
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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GB227162A
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US1604532A
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DE456570C
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US1749635A
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US1987412A
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US2297218A
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US2978671A
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US2978669A
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US3111187A
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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) | 1968-03-01 | 1968-08-31 | 1969-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-01 | 1972-08-31 | 1973-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-01 | 1976-08-31 | 1977-03-02 | $7700.00 | Window Closed / Lapsed |