US3391340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alarm production over broadcasting channel by using long duration dissonant tones discordant with musical scale to prevent false actuation
Assignee: Zenith Electronics LLC
•
Filing: 1964-05-19
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Granted: 1968-07-02
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Expires: 1984-05-19
Abstract
No abstract record available.
Inventors
- 👤 George W Fyler
- 👤 Karl E Hassel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:18
CPC Classifications
G; G08; G08B; G08B27/00; G08B27/008
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-02 | 1972-01-01 | 1972-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-02 | 1976-01-01 | 1976-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-02 | 1980-01-01 | 1980-07-02 | $7700.00 | Window Closed / Lapsed |