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Bacterial aerosol analyzer

  • US 3,001,914 A
  • Filed: 03/05/1956
  • Issued: 09/26/1961
  • Est. Priority Date: 03/05/1956
  • Status: Expired due to Term
First Claim
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3. A METHOD OF CLASSIFYING ACCORDING TO SIZE AND IDENTIFYING VIABLE MICROSCOPIC PARTICLES SUSPENDED IN AIR, WHICH COMPRISES PASSING A VOLUME OF AIR THROUGH A SERIES OF STAGES, EACH STAGE CONTAINING A PETRI DISH OF SOLID NUTRIENT MEDIUM BELOW A PERFORATED PLATE HAVING A FIXED NUMBER OF HOLES, THE SIZE OF WHICH IS CONSTANT IN EACH STAGE BUT WHICH DECREASES IN SIZE IN EACH SUCCEEDING STAGE, WHEREBY JETS OF AIR, PRODUCED BY DRAWING AIR THROUGH THE DEVICE , INCREASE IN VELOCITY WITH EACH SUCCEEEDING STAGE IS UTILIZED TO SEPARATE THE MICROSCOPIC SUCCEEDING STAGE IS UTILIZED TO SEPARATE THE MICROSCOPIC PARTICLES INTO GROUPS OF DECREASING SIZE AND MASS, SUCH THAT THE GROUPS OF PARTICLES ARE COLLECTED BY IMPACTION ON THE NUTRIENT MEDIUM OF EACH SUCCEEDING STAGE AND PARTICLES WHICH ARE OF INSUFFICIENT SIZE AND MASS TO BE IMPACTED ON A GIVEN STAGE FOLLOW THE AIR STREAM AROUND THE DISH INTO THE NEXT STAGE WHERE THE VELOCITY IS INCREASED SO THAT BY THE TIME THE LAST STAGE IS REACHED, ALL VIABLE PARTICLES WILL HAVE ATTAINED A VELOCITY SUFFICIENT FOR IMPACTION ON ONE STAGE OR ANOTHER WITH THE PARTICLES HAVING THE SMALLEST MASS BEING COLLECTED ON THE LAST STAGE, THEREAFTER INCUBATING THE PETRI DISHES WHEREBY VIABLE MICROSCOPIC PARTICLES WILL GROW INTO VISIBLE COLONIES, THE NUMBER OF WHICH REPRESENT THE NUMBER OF VIABLE PARTICLES COLLECTED ON THAT STAGE.

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