SENSING RESISTANCE DEVICE

• US 3,440,636 A
• Filed: 01/11/1966
• Issued: 04/22/1969
• Est. Priority Date: 01/11/1966
• Status: Expired due to Term

• Current Assignee: Michael T. Sliman
• Original Assignee: Michael T. Sliman
• Inventors: Sliman, Michael T.
• Application Number:
  US04/519,990
• Time in Patent Office: 1,197 Days
• US Class Current: 340/568.1
• CPC Class Codes: G08B 13/1409 for removal detection of electrical appliances by detecting their physical disconnection from an electrical system, e.g. using a switch incorporated in the plug connector

Claims

1. IN A SYSTEM FOR PROTECTING NORMALLY UNOBSERVED ARTICLES SUCH AS TELEVISION RECEIVERS AND THE LIKE IN LOCATIONS ACCESSIBLE TO THE PUBLIC SUCH AS HOTEL OR MOTEL ROOMS, FROM THEFT OR TAMPERING WHEREIN A REMOTE SIGNAL IS PRODUCED BY REMOVAL OR EXCESSIVE MOVEMENT OF THE ARTICLE BY AN UNAUTHORIZED PERSON COMPRISING AT LEAST ONE TELEVISION RECEIVER HAVING DISPOSED THEREIN A SENSING RESISTANCE DEVICE AND REMOTELY LOCATED MEANS FOR DETECTING CHANGES WITH RESPECT TO SAID SENSING RESISTANCE DEVICE AND GIVING AN ALARM IN RESPONSE TO SUCH CHANGES WITH RESPECT TO SAID SENSING RESISTANCE DEVICE DUE TO MOVEMENT OF OR TAMPERING WITH SAID TELEVISION RECEIVER HAS DISPOSED THEREIN SAID TELEVISION RECEIVER HAS DISPOSED THEREIN A SENSING RESISTANCE DEVICE COMPRISING A RESISTANCE ELEMENT AND AT LEAST ONE SWITCH FOR EFFECTING A CHANGE IN THE OVER-ALL ELECTRICAL RESISTANCE OF SAID SENSING RESISTANCE DEVICE IN RESPONSE TO MOVEMENT OF OR TAMPERING WITH SAID TELEVISION RECEIVER;

SAID SENSING RESISTANCE DEVICE INCLUDING A SWITCH HAVING AN AUTOMATICALLY RETURNING COMPRESSIBLE OPERATING MEMBER, SAID RESISTANCE DEVICE BEING ATTACHED TO SAID TELEVISION RECEIVER THEREBY CAUSING SAID SWITCH OPERATING MEMBER TO BE HELD IN THE COMPRESSED POSITION ONLY WHILE SAID RESISTANCE DEVICE IS PROPERLY ATTACHED TO SAID TELEVISION RECEIVER, AND WHEREIN SAID SENSING RESISTANCE COMPRISES A WHEATSTONE BRIDGE NORMALLY BALANCED WITH SAID RESISTANCE ELEMENT CONNECTED THEREIN AS AN ARM THEREOF.