Resources Contact Us Home
Sterilization of cryogenic liquids by ultrafiltration

Image Number 3 for United States Patent #4759848.

A cryogenic liquid is sterilized by passing it through a microporous filter, while subcooling the liquid. Subcooling virtually eliminates the possiblity of formation of gas bubbles in the liquid, and thereby insures that the desired mass flow of liquid, through the filter, will be maintained. The apparatus used with this invention comprises an insulated tank, filled with cryogenic liquid. A container having a microporous filter disposed therein, is submerged within the tank. The filter can be made of nylon mesh, which is encased within a polypropylene frame. The filter has a pore size of about 0.2 microns or less. The liquid to be sterilized is a saturated cryogenic liquid. The liquid in the tank is held at a temperature lower than that of the liquid to be sterilized, and therefore subcools the liquid being sterilized. The sterilized liquid is then withdrawn directly from the filter container.

  Recently Added Patents
Magnetic memory element, driving method for same, and nonvolatile storage device
Idle stop and go system and method for controlling thereof
Oscillator circuit which compensates for external voltage supply, temperature and process
Aware manufacturing of integrated circuits
Computer systems and methods for the query and visualization of multidimensional databases
Pressure washer
Arcuate motion control in electrostatic actuators
  Randomly Featured Patents
Air ring for inflation film molding
Tester for a semiconductor device
Speed detecting device mounting structure for a vessel
Apparatus for sewing fabric pieces to slide fastener chain
Bingo game with indicia distributed on videocassette
Method and apparatus for making friction locking threaded fasteners
Polyoxyalkylene polycarboxylate esters and a method of treating polyester fabric
Telephone handset