Patent US3423531A successfully refreshed from Google Patents.
US3423531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voice controlled amplifier
Assignee: TDK Micronas GmbH
•
Filing: 1965-08-16
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Granted: 1969-01-21
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Expires: 1985-08-16
Abstract
No abstract record available.
Inventors
- 👤 Harold W Doddington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:46
CPC Classifications
H; H04; H04M; H04M9/00; H04M9/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3046354A
Cited
US3071647A
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US3136864A
Cited
US3189691A
Cited
US3189690A
Cited
US3171901A
Cited
US3330912A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-21 | 1972-07-22 | 1973-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-21 | 1976-07-22 | 1977-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-21 | 1980-07-22 | 1981-01-21 | $7700.00 | Window Closed / Lapsed |