Patents by Inventor Britt Dahlgren

Britt Dahlgren 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).

  • Toy kit of stackable geometric shape pieces to form a structure
    Patent number: 5460561
    Abstract: A toy kit for forming a structure. Individual pieces include at least a cylinder, cone, cube and prism, and at least one additional piece. The piece can be assembled to form a structure, e.g. a sand castle. The pieces are hollow and open bottomed and include fixtures enabling mutual assembly together. Holes in their top walls permit passage of water or sand.
    Type: Grant
    Filed: December 16, 1993
    Date of Patent: October 24, 1995
    Assignee: Lennart Dahlgren
    Inventor: Britt Dahlgren