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Apparatus for determining hemoglobin and white blood cell count in blood

  • US 4,303,337 A
  • Filed: 03/26/1979
  • Issued: 12/01/1981
  • Est. Priority Date: 03/26/1979
  • Status: Expired due to Term
First Claim
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1. In an electronic particle analysis apparatus wherein there is provided a hydraulic and pneumatic system for moving fluids by hydraulic means and by pneumatic means from selected locations to predetermined destinations in accordance with a selected operating cycle and wherein a vacuum level is to be established for employment only to perform selected functions during said operational cycle, the improvement comprising vacuum generating means for establishing said vacuum and control means coupled thereto for operating said vacuum generating means to draw vacuum only when vacuum is required to move fluid through scanning aperture means for particle study during said operational cycle.

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