Patents by Inventor Daniel J. Christopherson

Daniel J. Christopherson 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).

  • Storage step
    Patent number: D465032
    Type: Grant
    Filed: November 30, 2001
    Date of Patent: October 29, 2002
    Assignee: The Plastic Lumber Company
    Inventors: Alan Robbins, Daniel J. Christopherson
  • Spa table
    Patent number: D484334
    Type: Grant
    Filed: November 27, 2002
    Date of Patent: December 30, 2003
    Assignee: The Plastic Lumber Company, Inc.
    Inventors: Alan E. Robbins, Daniel J. Christopherson
  • Spa step
    Patent number: D485915
    Type: Grant
    Filed: November 27, 2002
    Date of Patent: January 27, 2004
    Assignee: The Plastic Lumber Company, Inc.
    Inventors: Alan E. Robbins, Daniel J. Christopherson