US PATENT SUBCLASS 208 / 366
.~.~ Vacuum or pressure


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

Internet Version by PATENTEC © 1999      Terms of Use



208 /   HD   MINERAL OILS: PROCESSES AND PRODUCTS

308  DF  FRACTIONATION {5}
347  DF  .~ Distillation {12}
366.~.~ Vacuum or pressure


DEFINITION

Classification: 208/366

(under subclass 347) Processes wherein the vaporization zone is under a pressure greater or less than atmospheric pressure.

(1) Note. The use of pressures varying from atmospheric changes the relative volatility of the components of the distilland which may lower the boiling point of the respective components of the mixture thereby increasing the ease of separation of the components of the distilland.

SEE OR SEARCH CLASS

196, Mineral Oils: Apparatus,

114, for vaporizers adapted for distilling mineral oil under reduced pressure.

203, Distillation: Processes, Separatory,

91+, for a distillation process in which the distillation zone is under pressure or vacuum.