Patents by Inventor Robert P. Martin, Sr.

Robert P. Martin, Sr. 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: 4099590
    Abstract: An engine cover in an industrial lift truck forming a sound barrier between the engine and operator's station to reduce engine-related noise reaching the operator's station to acceptable levels particularly where the operator's station and engine cover are enclosed by a cab. The engine cover is provided with a double rigid wall construction comprised of an outer shell and an inner liner complementary in configuration to the shell and nested within it. The shell and liner components are mutually supported and spaced a predetermined distance by continuous support means generally along their peripheries and are free of mutual support in their central areas.
    Type: Grant
    Filed: February 17, 1977
    Date of Patent: July 11, 1978
    Inventor: Robert P. Martin, Sr.
  • Patent number: 4063442
    Abstract: A machine and method for shaping a workpiece into a cylindrical tube includes a mandrel, a forming roll, a guide roll, and a continuous forming belt extending partially around the mandrel and partially around the forming roll and guide roll. The workpiece is inserted between the belt and the mandrel at an entry opening. An actuator device causes the mandrel to simultaneously tighten the belt and squeeze the workpiece between the mandrel and the forming roll during the forming operation.
    Type: Grant
    Filed: November 29, 1976
    Date of Patent: December 20, 1977
    Inventor: Robert P. Martin, Sr.
  • Patent number: D249254
    Type: Grant
    Filed: February 17, 1977
    Date of Patent: September 5, 1978
    Inventor: Robert P. Martin, Sr.