Patents Assigned to Ruska Instrument Corporation
  • Pressure standard
    Patent number: 5259235
    Abstract: A differential pressure gage apparatus is disclosed which utilizes two pistons movable within three bores to produce accurate differential pressures. An inner piston carried by an outer piston has sufficient length to extend into all bores at once.
    Type: Grant
    Filed: February 6, 1992
    Date of Patent: November 9, 1993
    Assignee: Ruska Instrument Corporation
    Inventor: Kenneth A. Kolb
  • Transfer apparatus
    Patent number: 4466766
    Abstract: An apparatus for transferring wafers between a process carrier and a furnace carrier. The apparatus lifts a plurality of wafers from one carrier and deposits them into another carrier without damage to the wafers or touching any more than the edge surfaces and adjacent areas of the wafers.
    Type: Grant
    Filed: May 24, 1983
    Date of Patent: August 21, 1984
    Assignee: Ruska Instrument Corporation
    Inventors: Lorenzo D. Geren, deceased, Raymond D. Worden