Patents by Inventor Paul S. DeJong

Paul S. DeJong 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).

  • Window balance
    Patent number: 6115884
    Abstract: In a counterbalance having a torsion spring which is torqued by a thread follower rotated by axially reciprocal movement of a spiral rod through the follower and into the torsion spring, the pitch of the spiral thread changes continuously, smoothly and consistently at a nonlinear rate according to an equation.
    Type: Grant
    Filed: June 30, 1998
    Date of Patent: September 12, 2000
    Assignee: Iowa State University Research Foundation Inc.
    Inventors: Paul S. DeJong, Jeffrey Huston, deceased