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Freeze drying apparatus and method

  • US 3,281,949 A
  • Filed: 07/06/1964
  • Issued: 11/01/1966
  • Est. Priority Date: 07/06/1964
  • Status: Expired due to Term
First Claim
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4. A FREEZE DRYING PROCESS COMPRISING THE STEPS OF HEATING A FROZEN PRODUCT IN AN EVACUATED CHAMBER, CAUSIN THE ICE FREEZING SAID PRODUCT TO SUBLIME, COLLECTING THE SUBLIMED WATER VAPORS ON A CONDENSER, CAUSING THE COLLECTED VAPORS TO SOLIDIFY ON SAID CONDENSER, OPENING SAID CHAMBER TO THE ATMOSPHERE ADJACENT SAID PRODUCT, ESTABLISHING A CURTAIN OF HIGH VELOCITY AIR BETWEEN SAID PRODUCT AND SAID CONDENSER, REMOVING SAID PRODUCT FROM SAID CHAMBER, AND DEFROSTING SAID CONDENSER.

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