Patents by Inventor Sergio DeOliveira

Sergio DeOliveira 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).

  • Ladder top
    Patent number: D530025
    Type: Grant
    Filed: July 22, 2005
    Date of Patent: October 10, 2006
    Assignee: Werner Co.
    Inventors: R. Scott Patton, Pete Robinson, Sergio DeOliveira
  • Ladder leveler stile
    Patent number: D584422
    Type: Grant
    Filed: January 14, 2006
    Date of Patent: January 6, 2009
    Assignee: Werner Co.
    Inventors: Joseph C. Dangrow, James J. Grebinoski, Sergio DeOliveira