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| Number | Title | Issue Date |
| 7307515 | Trailer security system using multiple transmitter/receiver pairs A trailer security system for a utility trailer is disclosed. The trailer security system includes a pair of side detection units and a middle detection unit provided between the side detection units which are placed in the utility trailer. Upon entry of an intruder... | 12/11/2007 |
| 6885301 | Security system for windows A security system for detecting and expelling external intrusions at individual windows is provided. The security system includes an intrusion detection transmission system (100) having a human body detection sensor (110), an infra-red sensor (120 | 04/26/2005 |
| 4903863 | Security system An open cylinder adapted to receive a tear gas canister has a trigger mechanism that holds the canister well above the bottom of the cylinder. When the device is activated by an intruder, the operating mechanism withdraws trigger mechanism from under the ... | 02/27/1990 |
| 4698620 | Fluid-containing security device The present invention involves a multiple protection security device which is used to prevent and/or detect burglary of articles, particularly of consumer goods and the like. In one embodiment, the present invention is a remote signal-actuating device for... | 10/06/1987 |
| 4604609 | Security system A security arrangement for a closed door having an elongated member connected between the door and the wall and a tautly mounted string joining the door knob and an electrical switch on the wall, the string passing over the elongated member. When an attem... | 08/05/1986 |
| 4074637 | Pilfer proof display unit The disclosure is of a pilfer-proof display unit particularly useful for security of small articles such as rings and like jewelry while permitting a potential customer free access to the handling of the article.... | 02/21/1978 |
| 4055277 | Fluid dispensing anti-burglary device A fluid dispensing anti-burglar device is disclosed from which a pressurized fluid such as tear gas is discharged, when an unauthorized movement of an object is attempted. The anti-burglar device employs a security cable which will permit limited movement... | 10/25/1977 |
