Patents by Inventor Leonardo Rivera Negron

Leonardo Rivera Negron 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).

  • Patent number: 8231131
    Abstract: A cart that can be used as a hand truck for carrying heavy loads up and down a staircase is disclosed. The design has means for accommodating in any size of staircase steps and the small compact dimensions of the cart make it useful for around the corner maneuvering. The cart is divided into two parts that separates while doing the movements to step up or down thru the stairways then it unites together to repeat the cycle. Square rods on the side's holds and support the two parts of the cart and give strength to hold the heavy loads. It uses expansions springs to hold the two parts of the cart and it used to repeat the movements as its stretches away and snaps together.
    Type: Grant
    Filed: September 7, 2009
    Date of Patent: July 31, 2012
    Inventor: Leonardo Rivera Negron