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| Number | Title | Issue Date |
| 5981907 | Rear wiper monitoring theft deterrent circuit An apparatus and method for monitoring current flow through a resistive heating element and for detecting breakage of the heating element. In one preferred embodiment the heating element is disposed on a vehicle window. A current is passed through the hea... | 11/09/1999 |
| 4941424 | Door alarm A sonic alarm device is provided for signalling the opening of a door which is hingedly mounted adjacent the edge on a door frame for swinging movement about an upright hinge axis into and out of a closed position. The door alarm is mounted in the interio... | 07/17/1990 |
| 4921012 | Automatic water shut-off apparatus for building protection An automatic water shut-off apparatus for connection to an intrusion alarm system, such as a burglar alarm, that provides for protection of a building from water damage while the alarm is armed. An electrically controlled valve, which controls water flow ... | 05/01/1990 |
| 4873936 | Switching mechanism for anti-theft system An electrical switching mechanism has a pair of arcuate spring contact members which are mounted in a casing. An aperture is formed in the casing for receiving an actuator member which may comprise a screw or other similar actuator member. A camming membe... | 10/17/1989 |
| 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 |
| 4300461 | Grass seed planter having fluid injection soil opener A mobile grass seed planter having mounted thereon a frontal line of spaced water nozzles, and behind each nozzle, in a second or back row, is a row of outlets through which seed is directed under air pressure. In operation, as the planter is moved over t... | 11/17/1981 |
| 4118691 | Security system for a building A spring within a container is maintained in compression by a first movable pin that extends from the inside to the outside of a container. In response to the first pin being pulled from a set position, a spring drives a hammer against a dispensing button... | 10/03/1978 |
| 4024986 | Fluid dispensing anti-burglar device A fluid dispensing anti-burglar device is disclosed which discharges a fluid, containing a chemical such as tear gas, into an area to be protected when an intruder opens a window or a door or forces open a window or a door to enter a private or unauthoriz... | 05/24/1977 |
| 3957012 | Anti-burglary sound emitting device An anti-burglary sound emitting device in which a pressurized fluid is discharged to audibly oscillate a diaphram to create a warning signal when an intruder opens a window or door to enter an area unauthorized to the intruder. The anti-burglary device em... | 05/18/1976 |
