Patents by Inventor Harold Jack Greenspan

Harold Jack Greenspan 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).

  • Abrasive member
    Patent number: 4114322
    Abstract: An abrasive member providing a working surface characterized by having a multiplicity of upstanding angularly extending ridges. Particles of an abrasive material, such as diamond, are affixed to the ridges in a manner so that as the tops of the ridges wear down, fresh particles of the abrasive material will become reembedded therein, thereby continually presenting a fresh cutting surface.
    Type: Grant
    Filed: August 2, 1977
    Date of Patent: September 19, 1978
    Inventor: Harold Jack Greenspan
  • Fluted diamond drill
    Patent number: 4083351
    Abstract: A drill for use in drilling precious and semi-precious stones consisting of a body adapted to be rotated on its axis, said body having longitudinal cutter elements separated by longitudinal flutes, the surfaces of the body of said drill being covered by an abrasive layer consisting of a ductile metal, such as nickel, containing a multiplicity of abrasive particles.
    Type: Grant
    Filed: January 21, 1977
    Date of Patent: April 11, 1978
    Inventor: Harold Jack Greenspan