Patents by Inventor Martin Zoldan

Martin Zoldan 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).

  • Pre-tensioned sand core
    Patent number: 8397789
    Abstract: Provided are methods of replacing drilling holes in castings by pre-tensioning sand cores. These methods are used in long cylindrical shaped sand cores in cold core box processes. The urethane sand core is placed in compression to increase the core strength during handling, placing inside of the mold. The pre-tensioned urethane sand core is set in a casting mold so as to form a cavity in the casting mold. The molten metal is poured to form the cavity inside of the casting. The pre-tensioned urethane sand core maintains its initial shape during casting.
    Type: Grant
    Filed: August 25, 2005
    Date of Patent: March 19, 2013
    Inventor: Martin Zoldan
  • Pre-Tensioned Sand Core
    Publication number: 20080257515
    Abstract: Provided are methods of replacing drilling holes in castings by pre-tensioning sand cores. This methods are used in long cylindrical shaped sand cores in cold core box processes. The urethane sand core is placed in compression to increase the core strength during handling, placing inside of the mold. The pre-tensioned urethane sand core is set in a casting mold so as to form a cavity in the casting mold. The molten metal is poured to form the cavity inside of the casting. The pre-tensioned urethane sand core maintains its initial shape during casting.
    Type: Application
    Filed: August 25, 2005
    Publication date: October 23, 2008
    Inventor: Martin Zoldan