Patents by Inventor Shirley Lyford Tonkin

Shirley Lyford Tonkin 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).

  • Artificial baby feeding
    Patent number: 3946888
    Abstract: Artificial baby feeding apparatus for use with a container and teat has a flow directing means in the form of a one way valve or a restriction to prevent or restrict backflow of liquid from the teat to the container. A teat having a soft toroidal distal proximal portion assists in giving a satisfactory pumping action.
    Type: Grant
    Filed: December 7, 1973
    Date of Patent: March 30, 1976
    Inventor: Shirley Lyford Tonkin