Patents by Inventor F. Thomas Sim

F. Thomas Sim 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).

  • Heel recovery filtration process and apparatus
    Patent number: 4547296
    Abstract: A novel process for removing suspended solids from a liquid without loss of heel portion comprising circulating a suspension of a precoat filter aid through a closed chamber provided with at least one vertical tubular, liquid pervious filter aid retainer supported on a tube sheet with the lower pervious section level with said tube sheet until a filter cake is formed on said retainer, pumping a liquid with suspended solids through the chamber whereby clear liquid passes through said filter cake into said retainer where clear liquid is recovered and suspended solids are deposited on filter cake, continuing pumping liquid with suspended solids until a maximum differential pressure is reached, reduce the pumping rate of liquid while simultaneously increasing air pressure to a maximum of 15 psig in the chamber, draining liquid from the chamber through the filter cake and retainer while maintaining air pressure of 2 to 15 psig to recover the heel portion, abruptly back washing liquid through the retainer and filte
    Type: Grant
    Filed: September 15, 1983
    Date of Patent: October 15, 1985
    Assignee: Croll-Reynolds Engineering Co., Inc.
    Inventors: F. Thomas Sim, Louis D. Ancillai, Carson Leikam