Patents by Inventor Prentiss Porter Douglass

Prentiss Porter Douglass 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).

  • Twisted stud to plate tie
    Patent number: D618085
    Type: Grant
    Filed: October 31, 2007
    Date of Patent: June 22, 2010
    Inventors: Jin-Jie Lin, Prentiss Porter Douglass, Bryan Morgan Ables, Sam Thomas Hensen