Electric heating – Microwave heating – With diverse device
Reexamination Certificate
2005-05-31
2005-05-31
Leung, Philip H. (Department: 3742)
Electric heating
Microwave heating
With diverse device
C219S682000, C219S686000, C219S709000, C219S757000, C422S021000
Reexamination Certificate
active
06900421
ABSTRACT:
A surgical and dental instrument sterilizer is described. Liquid water is rapidly vaporized by microwave heating and steam is generated to attain a steam pressure of approximately 47 psi and a temperature of approximately 135° C. in the region of the articles to be sterilized. Micron-size water-droplets are intermittently sprayed onto the articles which are arranged on a tray, from both the top and from underneath thereof so as to thoroughly wet the surfaces. A 30-90 s duration of droplet spray is followed by pulsed microwave irradiation of the top and underneath surfaces for a similar period, as an example; this is followed by a plurality of spray/microwave cycles. Sterilizing conditions in the sterilizer chamber are maintained in the presence of the water spray/microwave flashing cycles since introducing small aliquots of water will not affect the desired sterilizing condition provided by superheated steam augmented by microwave radiation necessary to kill microbes including spores; however arcing from metal instruments when subjected to microwave radiation is substantially reduced.
REFERENCES:
patent: 6042637 (2000-03-01), Weinberg
patent: 6180070 (2001-01-01), Benson
patent: 6646241 (2003-11-01), Varma et al.
patent: 63-277095 (1988-11-01), None
patent: WO 03/048443 (2003-06-01), None
Cochran Freund & Young LLC
Ecofriend Technologies, Inc.
Freund Samuel M.
Leung Philip H.
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