Patents by Inventor David J. Cragie

David J. Cragie 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).

  • Teaching clock having indicia carrier allowing curvilinear translation of indicia
    Patent number: 5167507
    Abstract: The invention relates to an eductional aid for teaching children to tell the time. The aid includes a face and at least one pointer rotatable about a centrally disposed axis relative to the face. A carrier is provided which carries indicia which are position behind the face. The face includes apertures through which at least some of the indicia can be seen. A knob for moving said carrier is also provided so that the indicia may be selectively displayed through the apertures.
    Type: Grant
    Filed: May 10, 1991
    Date of Patent: December 1, 1992
    Assignee: Invicta Plastics Ltd.
    Inventors: Nicola J. Cobb, David J. Cragie