Patents by Inventor Roger Marriott

Roger Marriott 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: 4110218
    Abstract: The liquid which is delivered to cyclonic separators for final cleaning is precleaned twice, first in a drag tank and then by a magnetic separator. The dirty underflow from the cyclonic separators is subjected to two stages of aftercleaning, first in a second drag tank and then by a fabric filter.
    Type: Grant
    Filed: February 7, 1977
    Date of Patent: August 29, 1978
    Assignee: Barnes Drill Co.
    Inventors: Roger Marriott, Mark R. Estabrook