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Breathing apparatus

  • US 4,016,876 A
  • Filed: 07/30/1975
  • Issued: 04/12/1977
  • Est. Priority Date: 11/06/1973
  • Status: Expired due to Term
First Claim
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1. Breathing apparatus comprising:

  • a. means for providing a user with a gas to be breathed;

    b. a gas saver means for the capture of the initial portion of the user'"'"'s exhaled breath;

    c. carbon dioxide sensing means for sensing the carbon dioxide content of the user'"'"'s exhaled breath and operable to provide an output signal indicative thereof;

    d. means responsive to said output signal for preventing further capture of said exhaled breath during the time it is being exhaled, when the carbon dioxide content thereof attains a predetermined level;

    e. means for discharging said exhaled breath to atmosphere after said predetermined level has been attained.

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