LandOfFree - US Patents - Listing for Communications, electrical: acoustic wave systems and devices,Echo systems,Presence or movement only detection

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

Controlled wave pattern ultrasonic burglar alarm

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

Dual-band ultrasonic motion detector

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

Electronic intruder detection system

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

Electronic trip device with short delay function

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

Fish detection apparatus

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

Harbor fence

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

Harbor fence

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

Infra-sonic detector and alarm with self adjusting reference

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

Infra-sonic detector and alarm with self adjusting reference

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

Interference avoidance device for use in a sensor system

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

Intrusion alarm system for use with two-wire-cable

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

Intrusion detection apparatus

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

Intrusion detection method and apparatus

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

Intrusion detection method and apparatus

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

Means for reducing minimum sensing distance of an ultrasonic pro

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

Method and apparatus for detecting intrusion and...

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

Method and apparatus for monitoring swimming pools

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

Method and apparatus for plural document detection

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

Method and system for detecting objects at or below the water's