Patents by Inventor Helen Charlotte Douglas

Helen Charlotte Douglas 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).

  • Pet collar
    Patent number: D940407
    Type: Grant
    Filed: December 20, 2019
    Date of Patent: January 4, 2022
    Assignee: TENACIOUS INTERNATIONAL INC.
    Inventor: Helen Charlotte Douglas
  • Pet collar
    Patent number: D984065
    Type: Grant
    Filed: November 25, 2021
    Date of Patent: April 18, 2023
    Assignee: TENACIOUS INTERNATIONAL INC.
    Inventor: Helen Charlotte Douglas
  • Pet collar
    Patent number: D984066
    Type: Grant
    Filed: November 25, 2021
    Date of Patent: April 18, 2023
    Assignee: TENACIOUS INTERNATIONAL INC.
    Inventor: Helen Charlotte Douglas