US PATENT SUBCLASS 585 / 841
.~.~ H

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

Internet Version by PATENTEC © 1999      Terms of Use


585 /   HD   CHEMISTRY OF HYDROCARBON COMPOUNDS

800  DF  PURIFICATION, SEPARATION, OR RECOVERY {7}
833  DF  .~ By addition of extraneous agent, e.g., solvent, etc. {15}
841.~.~ H

DEFINITION

Classification: 585/841

Hi:

(under subclass 833) Subject matter wherein the added agent is hydrogen.

SEE OR SEARCH THIS CLASS, SUBCLASS:

250+, for processes of adding hydrogen to an unsaturated bond, especially subclasses 258+ for hydrogenation of an unsaturated bond of a contaminant.

(1) Note. "Hydrodesulfurization" processes are proper for placement in this subclass.