Electric heating – Metal heating – Cutting or disintegrating
Patent
1994-03-29
1995-11-21
Evans, Geoffrey S.
Electric heating
Metal heating
Cutting or disintegrating
B23K 1122
Patent
active
054689287
ABSTRACT:
An apparatus for destroying or rendering safe the metal needle portion of a hypodermic needle syringe in which the needle is destroyed by electrical resistance heating. The apparatus includes two electrodes that are generally disc shaped that are mounted so that they are a predetermined distance away from each other in an overlapping manner. During operation, the metal needle portion forms a resistive load between the electrodes which causes the metal to be incinerated and which causes switching circuitry to turn on a fan for a predetermined period of time. The fan draws smoke and emissions produced by incineration through a filter module. The filter module preferably includes a first filter having a porous layer and an antimicrobial layer, a second filter of activated carbon, a third filter of potassium manganate, and a fourth filter of activated carbon in series.
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patent: 4628169 (1986-12-01), Ch'ing-Lung
patent: 4965426 (1990-10-01), Colombo
patent: 5138124 (1992-08-01), Kirk et al.
patent: 5166488 (1992-11-01), Peppard
patent: 5245935 (1993-09-01), Fukuda
patent: 5264675 (1993-11-01), Butler
patent: 5282428 (1994-02-01), Greville et al.
patent: 5300752 (1994-04-01), Elmerick et al.
Evans Geoffrey S.
Inventive Services, Inc.
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