Patents by Inventor John Douglas Duffett

John Douglas Duffett 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).

  • Angle adaptor for bicycle head tube
    Patent number: 11541957
    Abstract: An angle adaptor for an integrated system (IS) bicycle frame head tube allows a user to change the effective head tube angle, and thus the fork trail, for a bicycle.
    Type: Grant
    Filed: May 27, 2021
    Date of Patent: January 3, 2023
    Assignee: NINE POINT EIGHT INC.
    Inventors: Jacobus Josef Pittens, John Douglas Duffett
  • ANGLE ADAPTOR FOR BICYCLE HEAD TUBE
    Publication number: 20210371043
    Abstract: An angle adaptor for an integrated system (IS) bicycle frame head tube allows a user to change the effective head tube angle, and thus the fork trail, for a bicycle.
    Type: Application
    Filed: May 27, 2021
    Publication date: December 2, 2021
    Inventors: Jacobus Josef Pittens, John Douglas Duffett
  • Angle adaptor for bicycle head tube
    Patent number: D1012784
    Type: Grant
    Filed: May 27, 2020
    Date of Patent: January 30, 2024
    Inventors: Jacobus Josef Pittens, John Douglas Duffett