Patents by Inventor Curtis F. Shuman

Curtis F. Shuman 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).

  • Two stage engine air breather filter
    Patent number: 4606743
    Abstract: An air filter for removing particulate matter from an airstream by cyclonic action and having replaceable primary and secondary filter elements.
    Type: Grant
    Filed: June 28, 1985
    Date of Patent: August 19, 1986
    Inventor: Curtis F. Shuman