Patents by Inventor Klaas Schaap

Klaas Schaap 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: 4834601
    Abstract: A wall fastener comprising a hollow conical member, a cylindrical sleeve member disposed substantially within the conical member, an anchoring member attached to the sleeve member for engaging the inner surface of a hollow wall and a rotatable threaded member extending through aligned openings in the conical member, sleeve member and anchoring member for tightly securing the fastener to the wall. The anchoring member is comprised of a central housing and a plurality of resilient curved feet flared outwardly from the housing. The feet are bendable toward the axis of the threaded member to allow the anchoring member to be inserted through a hole in the wall. When the anchoring member has cleaned the hole, the feet are spring-biased to return to the outwardly flared position to engage the inner surface of the wall.
    Type: Grant
    Filed: June 1, 1987
    Date of Patent: May 30, 1989
    Inventor: Klaas Schaap