Patents by Inventor B. E. Ingvar Sundberg

B. E. Ingvar Sundberg 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).

  • Patent number: 4037512
    Abstract: An expanding wire nail for fastening baseboards and the like to concrete walls has two aligned shank segments integrally joined by a ligament of cruciform cross-section forming a weakened zone between oblique wedge faces on the adjacent ends of the shank segments. The ligament and the wedge faces are formed by plastic deformation of the shank from opposite sides in a forming die assembly. The forming die assembly has opposed forming punches driven in phase opposition, each forming punch being driven in unison with one of two aligned tip cutting punches.
    Type: Grant
    Filed: October 24, 1974
    Date of Patent: July 26, 1977
    Assignee: Nordisk Kartro Aktiebolag
    Inventor: B. E. Ingvar Sundberg