Patents by Inventor D. Frank Howeth

D. Frank Howeth 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).

  • System for transfering used refrigerant from multiple small recovery cylinders to large shipping cylinder
    Patent number: 5322092
    Abstract: Apparatus and method for operating the apparatus is disclosed for transferring reclaimed refrigerant from multiple recovery cylinders to a larger shipping cylinder using a vapor compressor and four-way valve to first transfer liquid refrigerant and then vapor to the shipping cylinder. This system includes flexible hoses for liquid and vapor transfer and employs valves near the couplings for connections of the hoses to the cylinders. Operating methods then permit transfer from successive cylinders to the shipping cylinders and change-outs in the shipping cylinders without loss of significant refrigerant to the atmosphere, and without inclusion of air into the refrigerant in the shipping cylinder.
    Type: Grant
    Filed: April 14, 1992
    Date of Patent: June 21, 1994
    Assignee: E. I. Du Pont de Nemours and Co.
    Inventors: D. Frank Howeth, S. M. Tranchina