Patents by Inventor David Diperstein

David Diperstein 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: 5341554
    Abstract: An improvement to the method for repairing a cracked metal wall commonly known as cold welding, which is accomplished by inserting metal locks across a crack to join the metal on opposite sides of the gap, and then inserting repair plugs which act as plugs to fill the gap and simultaneously pre-stress the inserted locks. The improvement comprises the use of repair plugs which have been coated with an electro-deposited layer of zinc. The zinc layer improves the sealing capability of the repair plugs, and is thereby advantageous for repairing cracks in the pressure areas of engine blocks or other vessels, containers or housings which contain fluids under pressure.
    Type: Grant
    Filed: May 18, 1993
    Date of Patent: August 30, 1994
    Inventor: David Diperstein
  • Patent number: 4730968
    Abstract: A self-tapping, self-aligning thread repair insert is disclosed. The insert is an annular sleeve having a threaded interior surface, a partially threaded exterior surface, and an opening. The exterior surface has a tapered portion between a straight threaded portion and a straight thread-free portion. The thread-free portion and the opening are adjacent an end of the sleeve. The thread-free portion is free of threads for a distance of at least 1.5 thread widths from the end of the sleeve. The sleeve is made of a 400 series stainless steel. The sleeve is case hardened.
    Type: Grant
    Filed: September 8, 1986
    Date of Patent: March 15, 1988
    Assignees: David Diperstein, Groov-Pin Corporation
    Inventors: David Diperstein, Joseph D. Pagliuca
  • Patent number: 4599781
    Abstract: Thin metal parts such as one eighth inch or less cast iron or one quarter inch or less cast aluminum are repaired by drilling a series of overlapping holes extending generally perpendicular to the crack at each end of the crack and at spaced locations along the crack. A lock of the general outline of the series of overlapping holes is fixedly secured in each of the series of overlapping holes. At least one hole having a diameter no greater than 0.200 inches is drilled in the crack between the locks so that the hole overlaps a portion of one of the locks. The hole is tapped with a tap having at least 27 threads per inch and a plug having the same number of threads per inch as the tapped hole is secured in the tapped hole thereby pre-stressing the locks and filling the gap of the crack. The plug is torqued until the torquing force exceeds the strength of the plug thereby snapping off a portion of the plug which extends beyond the surface of the part.
    Type: Grant
    Filed: December 17, 1984
    Date of Patent: July 15, 1986
    Inventor: David Diperstein
  • Patent number: 4247973
    Abstract: Metal parts on opposite sides of a crack or the like are joined together by drilling holes in the metal and then inserting a fastener. A tool is provided which assures uniformity in the location of contiguous holes into which the fastener is inserted.
    Type: Grant
    Filed: June 25, 1979
    Date of Patent: February 3, 1981
    Assignee: Seal Lock International, Inc.
    Inventor: David Diperstein