| 摘要 |
988,143. Food preserving. NATIONAL RESEARCH DEVELOPMENT CORPORATION. July 28, 1961 [Aug. 8, 1960], No. 27379/60. Heading A2D. In a process of preserving foodstuffs by drying, or by freeze-drying of pre-frozen foodstuffs in which the foodstuff 4 is sandwiched between heating elements 7 faced with expanded metal or plastic 6, e.g. as in Specification 926,174, sheets of perforated material 5, e.g. metal or plastic, are interposed between the expanded metal and the foodstuff and may be secured to the expanded metal by means of removable clips 8. |
