Patents by Inventor William J. Walkotten

William J. Walkotten 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).

  • Cryogenic sediment sampler
    Patent number: 4038875
    Abstract: A stream bed sediment sampler easily obtains a nearly undisturbed, stratified sample containing stream gravel, intergravel water, and organic material. The temperature of a probe inserted into the sediment is quickly reduced to a point where the material immediately surrounding the probe freezes and clings to the probe upon its removal from the stream bed. The equipment is inexpensive, easy to assemble, and portable.
    Type: Grant
    Filed: May 18, 1976
    Date of Patent: August 2, 1977
    Assignee: The United States of America as represented by the Secretary of Agriculture
    Inventor: William J. Walkotten