Patents by Inventor Donald R. Landers

Donald R. Landers 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).

  • Pressure differential filtering device and method
    Patent number: 4035294
    Abstract: A pressure differential sampling and filtering device and method comprising a tube adapted to hold a liquid to be filtered and an inner tube having a filter head adapted to be inserted into the tube and force the liquid up through the filter head into the inner tube is characterized by the employment of a filter head and by the inner tube being associated with and separable from a closed-end portion which then serves as a test tube when the assembly is inverted and the filter head separated therefrom.
    Type: Grant
    Filed: May 23, 1975
    Date of Patent: July 12, 1977
    Assignee: Denver Chemical Manufacturing Company
    Inventors: Donald R. Landers, Walter Greenfield, Peter D. Tukey