Patents by Inventor Henry Spreitzer

Henry Spreitzer 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).

  • Dump trailer
    Patent number: 6254192
    Abstract: A dump trailer having a bed pivotally attached at its rear end to a trailer frame. The trailer bed is raised and lowered by use of an air bag assembly attached at one end to the trailer frame and attached at the other end to the trailer bed. The trailer has a frame formed of hollow frame members which form a reservoir for holding compressed air. Conduit and valve means communicate the compressed air in the hollow frame members with the air bag assembly for inflation to thereby raise the trailer bed. The valve permits air to be exhausted from the air bag assembly to lower the trailer bed. An air compressor operated from the rotation of one of the trailer tires during movement of the trailer provides compressed air to the hollow frame members.
    Type: Grant
    Filed: August 8, 2000
    Date of Patent: July 3, 2001
    Inventor: Henry Spreitzer