Patents by Inventor Tazuko AOI

Tazuko AOI 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).

  • Stepladder
    Patent number: 9689204
    Abstract: A stepladder provided with a coupling frame in the shape of an equilateral triangle, a front support, a rear right support, a rear left support, and spread stoppers for stopping the front support, the rear right support, and the rear left support from spreading. The front support is rotationally attached to a front shaft of the coupling frame, the rear right fixing member is rotationally attached to a right shaft, and the rear left fixing member is rotationally attached to a left shaft. The rear left support and the rear right support are detachably mounted to the rear left fixing member and the rear right fixing member, respectively. The supports of the stepladder are coupled by the spread stoppers, whereby the three supports are restricted from being displaced forward, to the right rear, and to the left rear.
    Type: Grant
    Filed: January 29, 2014
    Date of Patent: June 27, 2017
    Inventors: Tokuo Aoi, Tazuko Aoi
  • STEPLADDER
    Publication number: 20150345219
    Abstract: A stepladder provided with a coupling frame in the shape of an equilateral triangle, a front support, a rear right support, a rear left support, and spread stoppers for stopping the front support, the rear right support, and the rear left support from spreading. The front support is rotationally attached to a front shaft of the coupling frame, the rear right fixing member is rotationally attached to a right shaft, and the rear left fixing member is rotationally attached to a left shaft. The rear left support and the rear right support are detachably mounted to the rear left fixing member and the rear right fixing member, respectively. The supports of the stepladder are coupled by the spread stoppers, whereby the three supports are restricted from being displaced forward, to the right rear, and to the left rear.
    Type: Application
    Filed: January 29, 2014
    Publication date: December 3, 2015
    Inventors: Tokuo AOI, Tazuko AOI
  • Stepladder
    Patent number: D757959
    Type: Grant
    Filed: April 28, 2015
    Date of Patent: May 31, 2016
    Inventors: Tokuo Aoi, Tazuko Aoi
  • Stepladder
    Patent number: D758615
    Type: Grant
    Filed: April 28, 2015
    Date of Patent: June 7, 2016
    Inventors: Tokuo Aoi, Tazuko Aoi
  • Stepladder
    Patent number: D761442
    Type: Grant
    Filed: December 11, 2014
    Date of Patent: July 12, 2016
    Inventors: Tokuo Aoi, Tazuko Aoi
  • Stepladder
    Patent number: D765269
    Type: Grant
    Filed: April 28, 2015
    Date of Patent: August 30, 2016
    Inventors: Tokuo Aoi, Tazuko Aoi