Patents by Inventor Peter Roy Smith

Peter Roy Smith 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).

  • Filter element
    Publication number: 20020117440
    Abstract: A spring filter element having a plurality of coils. The coils are pre-tensioned with the degree of pre-tension varied progressively along the length of the filter such that any part of the filter, in one vertical orientation of the element, supports the dependent remainder of the filter to maintain a closed coil state during normal use. This allows substantially equal opening of the filter gaps between the coils when the element is extended and submerged in fluid.
    Type: Application
    Filed: February 21, 2002
    Publication date: August 29, 2002
    Applicant: CROSS MANUFACTURING (1938) LIMITED
    Inventors: Edward Henry Cross, William Frederick Smith-Haddon, Peter Roy Smith