Patents Assigned to Millipore Investment Holdings, Ltd.
  • Fluid dispensing system having independently operated pumps
    Patent number: 6251293
    Abstract: A fluid dispensing system is provided which has a first diaphragm pump, a filter connected to receive the discharge of said first pump, and an accumulator/second diaphragm pump connected to receive the discharge of said filter. Hydraulic fluids pumped by cylinder/piston/stepper assemblies independently actuate each of the diaphragm pumps, providing accurate, controllable and repeatable dispense of the subject fluid. The system further includes a suck-back device downstream of the second pump.
    Type: Grant
    Filed: February 14, 2000
    Date of Patent: June 26, 2001
    Assignee: Millipore Investment Holdings, Ltd.
    Inventors: Ocie T. Snodgrass, Michael K. Farney, Gregory M. Gibson
  • Fluid dispensing system
    Patent number: 6105829
    Abstract: A fluid dispensing system is provided which has a first diaphragm pump, a filter connected to receive the discharge of said first pump, and a accumulator/second diaphragm pump connected to receive the discharge of said filter. Hydraulic fluids pumped by cylinder/piston/stepper assemblies independently actuate each of the diaphragm pumps, providing accurate, controllable and repeatable dispense of the subject fluid.
    Type: Grant
    Filed: June 29, 1998
    Date of Patent: August 22, 2000
    Assignee: Millipore Investment Holdings, Ltd.
    Inventors: Ocie T. Snodgrass, Michael K. Farney, Gregory M. Gibson
  • Porous composite membrane and process
    Patent number: 5629084
    Abstract: A composite porous membrane is provided which comprises a porous membrane substrate having an average pore size between 0.01 and 10 microns formed of a first polymer which is coated over its entire surface with a crosslinked second polymer. The second polymer is dissolved in a solvent with a free radical polymerization initiator in the absence of a crosslinking agent. The second polymer is crosslinked in situ and rendered insoluble by mild heating and/or exposure to ultraviolet light.
    Type: Grant
    Filed: October 19, 1995
    Date of Patent: May 13, 1997
    Assignee: Millipore Investment Holdings Ltd.
    Inventor: Wilson Moya