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| Number | Title | Issue Date |
| 4009476 | Apparatus for automatically controlling door operation An apparatus for automatically controlling the operation of a door comprises a microwave transceiver responsive to detect the movement of a randomly moving object and operative to develop a Doppler signal representative of such movement, the Doppler signa... | 02/22/1977 |
| 4003045 | Intrusion detection systems with turbulence discrimination An intrusion alarm system employs ultrasonic frequencies and operates in the presence of turbulence. The system includes a differentiator and an integrator, each coupled to a sample and hold circuit; the differentiated pulses determining the level from th... | 01/11/1977 |
| 3990081 | Doppler radar device A Doppler radar device in which a detector diode is arranged in a flared horn which constitutes the aerial of the device. A metal sleeve is arranged in the flared horn perpendicular to the axis and parallel to the smaller sides of the horn, the said body ... | 11/02/1976 |
| 3987427 | Doppler detection device with phase shift means to inhibit false alarms A Doppler principle detection device includes means for transmitting signals into a field to be protected, means for receiving signals from said field, quadrature mixers for multiplying a reference signal and the received signal to discern between positiv... | 10/19/1976 |
| 3986182 | Multi-zone intrusion detection system An ultrasonic intrusion detection system having means for transmitting and receiving ultrasonic energy within a protected zone and generating an alarm when a moving object is present in the protected zone is supplemented to provide multiple independent re... | 10/12/1976 |
| 3967283 | Large area motion sensor An intrusion detector operating with electromagnetic sensors to detect intruder motion within large, defined areas is disclosed. The system provides an acceptably low false alarm rate by means of range discrimination whereby moving objects outside the pro... | 06/29/1976 |
| 3964063 | Traffic-surveillance system A traffic-surveillance system comprises a radar equipment coupled to a transmitter/receiver antenna. This antenna is formed by a transmission line including an elongate hollow conductor with leakage losses, such as a slotted coaxial cable or waveguide, pr... | 06/15/1976 |
| 3947834 | Doppler perimeter intrusion alarm system using a leaky waveguide A flexible line distributed antenna, defining a perimeter of interest, radiates energy supplied from a transceiver. Motion around the flexible line causes the reflected energy which is intercepted by the flexible distributed antenna to be coupled back to ... | 03/30/1976 |
| 3943513 | System and method for selecting Doppler altered reflected signals A matched transmission line coupling an RF generator to an antenna and receiving Doppler altered reflected signals from the antenna. A pair of diodes coupled to the transmission line 90 electrical degrees apart at the RF frequency and oppositely poled so ... | 03/09/1976 |
| 3942178 | Intrusion detection system An ultrasonic or microwave intrusion detection system uses a transmitter having one or more transducers or antennas for maintaining wave fields in the area to be protected and fed by one or more transducers or antennas which detects echo reflections of th... | 03/02/1976 |
| 3932871 | FM/CW surveillance radar system with range gating A single FM/CW radar antenna and accompanying electronics are positioned within a space that is to be guarded. A moving object within the space under surveillance produces a doppler frequency shift in the echo return signal which return signal is, in turn... | 01/13/1976 |
