Air purifier

  • US 6,893,610 B1
  • Filed: 11/21/1998
  • Issued: 05/17/2005
  • Est. Priority Date: 11/21/1997
  • Status: Expired due to Fees
First Claim
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1. An air purifier system comprising:

  • (a) a housing comprising;

    (i) entrance chamber means to receive air from outside the housing, and (ii) second chamber means communicating with the entrance chamber means to receive air therefrom and comprising exit means through which to expel air from the housing;

    (b) means to move an airstream into the housing through the entrance chamber means and on through the second chamber means and out through the exit means;

    (c) first ultraviolet radiation generating means in the entrance chamber means to produce very ultraviolet radiation having a wavelength less than about 200 nm.;

    (d) first control means to control the first ultraviolet radiation generating means to irradiate the airstream in the entrance chamber means for first selected intervals of time to react destructively with airborne contaminants in the entrance chamber means and to react with molecular oxygen in the airstream in the entrance chamber means to produce ozone to react destructively with contaminants in the housing and beyond the housing;

    (e) second ultraviolet radiation generating means in the second chamber means downstream of the first ultraviolet radiation generating means to generate radiation having a wavelength greater than 200 nm.;

    (f) second control means to selectively energize the second ultraviolet radiation generating means for second selected intervals of time to irradiate the airstream in the second chamber means with ultraviolet radiation having a wavelength greater than 200 nm. to react destructively with airborne contaminants in the second chamber means and to react destructively with ozone in the airstream in the second chamber means;

    (g) wherein the housing comprises an elongated hollow tube, a first end portion of which comprises the entrance chamber means and the opposite end portion of which comprises the second chamber means, with the exit means at the remote end of the tube from the first end portion;

    (h) wherein the first and second ultraviolet radiation generating means are lamps of generally cylindrical shape axially aligned in the hollow tube;

    (i) wherein the first control means to control the first ultraviolet radiation generating means comprises a first lamp driver and a first timer to control the operation of the first lamp driver;

    (i) wherein the second control means to control the second ultraviolet radiation generating means comprises a second lamp driver and a second timer to control the operation of the second lamp driver; and

    ;

    (k) wherein the air purifier system further comprises a reactive filter across the exit means to reduce residual amounts of ozone in the stream of air passing through the exit means.

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