Anticipate This!™ | Patent and Trademark Law Blog

They Invented What? (No. 157)

Posted in They Invented What? by Jake Ward on January 6, 2010

U.S. Pat. No. 5,675,318:  Graffiti prevention apparatus.

 

What is claimed is:

1. A graffiti thwarting system, comprising:
          proximity detectors adapted to be mounted adjacent a surface to be defaced,
          transmitter means, supported adjacent said surface, for emitting signals, and
          means, responsive to said transmitter means signals, for preventing marking material released from a pressurized spray canister from reaching said surface.

2. The graffiti thwarting system of claim 1, wherein said transmitter means comprises radio transmitting means, and said preventing means includes radio receiving means.

3. The graffiti thwarting system of claim 1, wherein said preventing means comprises a delivery tube for transporting said marking media to a spray nozzle, and means coupled with said delivery tube for inhibiting the flow of said marking material to said spray nozzle.

4. The graffiti thwarting system of claim 3, wherein said flow inhibiting means comprises an enlarged conduit section connecting upper and lower delivery tube portions, and plug means supported for movement in said conduit section between a first flow permitting position and a second flow inhibiting position.

5. The graffiti thwarting system of claim 4, wherein said enlarged conduit is elongated in the direction of the extent of the delivery tube, and said plug moves linearly between said first and second positions.

6. The graffiti thwarting system of claim 4, wherein said spray canister further includes means, actuated by the signals emitted by said transmitter means, for driving said plug between said first end second positions.

7. The graffiti thwarting system of claim 6, wherein said means for driving said plug between said first and second positions comprises an electromagnet.

8. The graffiti thwarting system of claim 7, wherein said driving means further includes a power source and means coupled with said power source for selectively actuating said electromagnet.

9. The graffiti thwarting system of claim 3, wherein said spray preventing means includes means for breaking the connection between said delivery tube and said spray nozzle.

10. The graffiti thwarting system of claim 9, wherein said delivery tube includes a magnetic portion, and said connection breaking means comprises a rotatable magnetic disk positioned adjacent said magnetic portion of said delivery tube, motor means coupled with and actuatable to rotate said disk, and means carried by said spray canister for selectively actuating said motor means, whereby when said motor means is actuated, an upper portion of said delivery tube is rotated out of correspondence with said spray nozzle channel.

11. The graffiti thwarting system of claim 10, wherein said magnetic portion of said delivery tube includes a magnetic strip secured to the exterior surface of said tube.

12. The graffiti thwarting system of claim 1, wherein said preventing means comprises signal receiving means, field generating means coupled with said signal receiving means for creating a magnetic field adjacent to said surface, and ferromagnetic material mixed with said spraying material, whereby when the marking material is released from said pressurized spray canister, said marking material is repelled by said magnetic field created adjacent to said surface.

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