Ultrasonic detecting means

• US 3,275,975 A
• Filed: 12/21/1964
• Issued: 09/27/1966
• Est. Priority Date: 12/21/1964
• Status: Expired due to Term

• Current Assignee: Joseph W. King
• Original Assignee: Joseph W. King
• Inventors: King, Joseph W.
• Application Number:
  US04/419,758
• Time in Patent Office: 645 Days
• US Class Current: 367/96
• CPC Class Codes: G01S 15/523 for presence detection burglar, theft or intruder alarms G08B13/00, e.g. G08B13/16
• CPC Class Codes: G08B 13/16 Actuation by interference with mechanical vibrations in air or other fluid
• CPC Class Codes: G08B 13/1627 using Doppler shift detection circuits

Claims

1. IN A SYSTEM FOR DETECTING THE ABSENCE OF MOVEMENT OF AN ULTRASONIC ENERGY REFLECTING BODY WITHIN A PREDETERMINED PERIOD COMPRISING:

AN ULTRASONIC TRANSMITTER FOR TRANSMITTING A BEAM OF ENERGY TOWARD SAID BODY;

AN ULTRASONIC DOPPLER RECEIVER INCLUDING A TRANSDUCER FOR RECEIVING ENERGY REFLECTED FROM SAID BODY;

ALARM MEANS FOR INDICATING THE FAILURE OF SAID RECEIVER TO RECEIVING A DOPPLER SIGNAL FROM SAID BODY WITHIN SAID PREDETERMINED PERIOD;

AND RESETTABLE TIME-OUT MEANS CONNECTED BETWEEN SAID RECEIVER AND SAID ALARM MEANS AND INCLUDING MEANS FOR ACTUATING SAID ALARM MEANS WHEN NO DOPPLER SIGNAL IS RECEIVED WITHIN SAID PREDETERMINED PERIOD.