Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1996-05-06
1997-10-07
Hofsass, Jeffery
Communications: electrical
Condition responsive indicating system
Specific condition
340541, 222 61, 22215311, 2224021, G08B 2100
Patent
active
056753187
ABSTRACT:
A system of components for preventing the application of graffiti to property includes one or more sensors and a signal transmitter at or near the surface to be defaced, and signal receiving means for actuating a mechanism in the spray apparatus or at the surface to be protected which will enable prevention of the surface targeted for defacement. One embodiment of the invention includes a signal receiver in the spray canister which actuates an electromagnet to move a plug in the marking material delivery tube to a flow blocking position. A second embodiment of the invention includes a signal receiver in the spray canister coupled to a rotatable magnet for rotating the upper end of the delivery tube away from the spray nozzle thereby breaking the path through which the marking material travels from the spray apparatus to the target surface. A third embodiment of the invention provides for the creation of an electromagnetic field at the targeted surface, and the mixing of the marking material (either by the "paint" manufacturer or afterwards) with a magnetic material so that when sprayed at the surface, the marking material is repelled.
REFERENCES:
patent: 3815784 (1974-06-01), Hansel
patent: 4866423 (1989-09-01), Anderson
patent: 4996521 (1991-02-01), Hollow
patent: 5025962 (1991-06-01), Renfro
patent: 5528220 (1996-06-01), Woods
Hofsass Jeffery
La Anh
Lewis Terrell P.
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