Patents by Inventor Ralph S. Marcus

Ralph S. Marcus 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).

  • Apparatus for internal finishing of metal parts
    Patent number: 4581853
    Abstract: This invention provides a process and apparatus for internal deburring, definning, and other internal finishing of metal parts by immersing the metal parts in a finishing media such as aluminum oxide and vibrating the metal parts at frequencies up to about 60 cycles per second.
    Type: Grant
    Filed: April 10, 1984
    Date of Patent: April 15, 1986
    Inventor: Ralph S. Marcus