Apparatus for freeze-drying and method

• US 3,218,727 A
• Filed: 07/17/1962
• Issued: 11/23/1965
• Est. Priority Date: 07/17/1962
• Status: Expired due to Term

• Current Assignee: Dorothy C. Lind
• Original Assignee: Dorothy C. Lind
• Inventors: Lind, Dorothy C.
• Application Number:
  US04/210,385
• Time in Patent Office: 1,225 Days
• US Class Current: 34/287
• CPC Class Codes: F26B 5/06 the process involving freezing

Claims

3. THE METHOD OF DRYING A SLURRY THAT COMPRISE THE STEPS OF:

(A) MOVING A LAYER OF SLURRY ALONG A PREDETERMINED PATH OF TRAVEL;

(B) PROGRESSIVELY FREEZING THE MOISTURE IN SAID SLURRY DURING SAID MOVEMENT;

(C) INVERTING THE MATERIAL OF SAID SLURRY DURING SAID MOVEMENT AT A POINT IN SAID PATH AFTER A SUBSTANTIAL AMOUNT OF THE MOISTURE HAS BEEN FROZEN BUT BEFORE ALL OF SAID MOISTURE HAS BEEN FROZEN, AND THEN CONTINUING THE MOVEMENT OF SAID SLURRY DURING FREEZING OF THE MOISTURE THEREIN UNTIL SUBSTANTIALLY ALL OF SAID MOISTURE HAS BEEN FROZEN;

(D) THE SAID FREEZING OF SAID MOISTURE BEING EFFECTED BY BLOWING ATMOSPHERIC AIR AT A TEMPERATURE OF FROM APPROXIMATELY -- 15*F. TO APPROXIMATELY -30*F. DOWNWARDLY AGAINS SAID LAYER WHEREBY