US PATENT SUBCLASS 250 / 289
.~ With evacuation or sealing means


Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use



250 /   HD   RADIANT ENERGY

281  DF  IONIC SEPARATION OR ANALYSIS {7}
289.~ With evacuation or sealing means


DEFINITION

Classification: 250/289

(under subclass 281) Subject matter having means producing a subatmospheric pressure environment for the selecting means or means to maintain the pressure of the environment of the selecting means sub atmospheric.