4. Communications, electrical: acoustic wave systems and devices
  5. Echo systems
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Circuit arrangement for ultrasonic burglar security systems oper

Communications – electrical: acoustic wave systems and devices – Echo systems – Presence or movement only detection
Patent

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Circuit arrangement of an ultrasonic-presence motion detector, p

Communications – electrical: acoustic wave systems and devices – Echo systems – Presence or movement only detection
Patent

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Coded acoustic alarm transmitter/receiver system

Communications – electrical: acoustic wave systems and devices – Echo systems – Presence or movement only detection
Patent

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Constant range ultrasonic motion detector

Communications – electrical: acoustic wave systems and devices – Echo systems – Presence or movement only detection
Patent

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Controlled wave pattern ultrasonic burglar alarm

Communications – electrical: acoustic wave systems and devices – Echo systems – Presence or movement only detection
Patent

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