Acoustical switch
US3970987A · kind A · utility
34Cited by
6References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 31, 1974 |
| Grant date | Jul 20, 1976 |
| Priority date | — |
| Expiry date | May 31, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S1/72
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An acoustical switch is actuated from a remote location by a sound generator such as an ultrasonic whistle. The switch includes a special tuned signal receiver coupled with an amplifier having a frequency selective feedback network. The output of the amplifier is an a.c. signal which is applied to a bistable circuit which, in one state, energizes a relay to turn on an appliance connected to the switch and, in its other state, turns the appliance off.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.