Patents by Inventor Donald S. Trevarthen

Donald S. Trevarthen 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).

  • Floor maintenance machine and method
    Patent number: 4586208
    Abstract: This is a floor maintenance machine in the nature of a carpet extractor and a method of operating it whereby it may be operated either as a single cycle unit or a recycling unit. It also includes a method and apparatus for converting a carpet extractor so that the running time between solution changes is greatly extended. There is also a back flushing arangement of the filter which extends running time. The unit also has a liquid surge control. It also includes or encompasses a convertability cart which may function in several ways.
    Type: Grant
    Filed: December 17, 1984
    Date of Patent: May 6, 1986
    Assignee: Tennant Company
    Inventor: Donald S. Trevarthen