Patents by Inventor Jan Abraham Van Asselt

Jan Abraham Van Asselt 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: 7134975
    Abstract: Apparatus for practicing the techinque of lofting a ball, the apparatus having a support frame containing two upright supports linked by a horizontal cross-bar. Two inclined guideways extend between ground anchors and the supports. A substantially inelastic reciprocating device is connected to and freely movable along the guideways and a ball connected to the reciprocating device.
    Type: Grant
    Filed: May 25, 2000
    Date of Patent: November 14, 2006
    Inventor: Jan Abraham Van Asselt
  • Patent number: 7014577
    Abstract: Apparatus for improving the skills of a sports person comprises two diverging guidelines at least one of which is resilient and tensioned. A reciprocating line extends between and is connected to each guideline whose length is equal to or greater than the minimum spacing of the guidelines and less than the maximum spacing of the guidelines. A ball is connected to and generally coaxial with the reciprocating line, the arrangement being such that when the ball is struck the reciprocating line is moved by its connection with the ball along the guidelines in the direction of their divergence until restrained from further movement by forces imposed on the line caused by the increased spacing between the guidelines and stretching of the resilient guideline(s). The ball and reciprocating line are returned to their starting positions (or positions close thereto) along the guidelines in the direction of their convergence through reactive forces generated between the reciprocating line and the resilient guideline(s).
    Type: Grant
    Filed: November 6, 2001
    Date of Patent: March 21, 2006
    Inventor: Jan Abraham Van Asselt
  • Patent number: 6821216
    Abstract: An apparatus for use in playing and practicing ball games is disclosed, the apparatus including a ball suspended by a substantially inelastic upstanding line from an upper, generally horizontal or inclined elongated guideway and connected by the same or a second substantially inelastic upstanding line to a lower, generally horizontal or inclined elongated guideway. The lower guideway may be at ground level and the height of the ball above the ground may be adjustable.
    Type: Grant
    Filed: August 22, 2000
    Date of Patent: November 23, 2004
    Inventor: Jan Abraham Van Asselt
  • Publication number: 20040072632
    Abstract: Apparatus for improving the skills of a sports person comprises two diverging guidelines at least one of which is resilient and tensioned. A reciprocating line extends between and is connected to each guideline whose length is equal to or greater than the minimum spacing of the guidelines and less than the maximum spacing of the guidelines. A ball is connected to and generally coaxial with the reciprocating line, the arrangement being such that when the ball is struck the reciprocating line is moved by its connection with the ball along the guidelines in the direction of their divergence until restrained from further movement by forces imposed on the line caused by the increased spacing between the guidelines and stretching of the resilient guideline(s). The ball and reciprocating line are returned to their starting positions (or positions close thereto) along the guidelines in the direction of their convergence through reactive forces generated between the reciprocating line and the resilient guideline(s).
    Type: Application
    Filed: December 3, 2003
    Publication date: April 15, 2004
    Inventor: Jan Abraham Van Asselt