Patent US2162247A successfully refreshed from Google Patents.
US3475751A
Expired / Lapsed
US
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Remote sound monitoring and control system
Assignee: Executone Inc
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Filing: 1966-07-07
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Granted: 1969-10-28
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Expires: 1986-07-07
Abstract
No abstract record available.
Inventors
- 👤 Howard M Sontag
- 👤 Milton Bernhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:08
CPC Classifications
G; G08; G08B; G08B25/00; G08B25/01; G08B25/018; G08B13/00; G08B13/16; G08B13/1654; G08B13/1672
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) | 1972-10-27 | 1973-04-28 | 1973-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-27 | 1977-04-28 | 1977-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-27 | 1981-04-28 | 1981-10-28 | $7700.00 | Window Closed / Lapsed |