Patents by Inventor Michael C. H. Chang

Michael C. H. Chang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5245839
    Abstract: An adsorption-type refrigerant recovery apparatus for a refrigeration and air conditioning system that has a connection unit, a refrigerant flow direction control device, a refrigerant adsorbing/desorbing device, a refrigerant/lubricant separating device, a condensation heat exchanging device, a drying/purging device, and a refrigerant reservoir. When the refrigerant enters the connection unit from the refrigeration and air conditioning system, the flow direction control device controls the refrigerant flowing through the adsorbing/desorbing device so that the refrigerant absorbs part of the heat energy of the adsorbent and is thus vaporized. The vaporized refrigerant then enters the refrigerant/lubricant separating device to separate the lubricant therein. The flow direction control device further controls the refrigerant entering the adsorbent container to allow the adsorbent to adsorb the refrigerant. When the adsorbent is saturated, the adsorbent is heated to desorb the refrigerant in a gaseous state.
    Type: Grant
    Filed: August 3, 1992
    Date of Patent: September 21, 1993
    Assignee: Industrial Technology Research Institute
    Inventors: Michael C. H. Chang, Viung C. Mei, Chung Y. Yang, Yie Z. R. Hu