US PATENT SUBCLASS 423 / 573.1
.~.~.~ Hydrogen sulfide

Current as of: June, 1999
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423 /   HD   CHEMISTRY OF INORGANIC COMPOUNDS

511  DF  SULFUR OR COMPOUND THEREOF {4}
567.1  DF  .~ Elemental sulfur {5}
571  DF  .~.~ Reacting a sulfide {3}
573.1.~.~.~ Hydrogen sulfide {4}
574.1  DF  .~.~.~.~> With sulfur dioxide {3}
576.2  DF  .~.~.~.~> With specified procedure for sulfur recovery or specified conditions for producing sulfur in more recoverable form
576.4  DF  .~.~.~.~> By reacting gaseous feed stream with liquid aqueous mixture {2}
576.8  DF  .~.~.~.~> By reacting gaseous feed with gas containing free oxygen

DEFINITION

Classification: 423/573.1

Hydrogen sulfide:

(under subclass 571) Subject matter in which the sulfide reacted is hydrogen sulfide.

SEE OR SEARCH THIS CLASS, SUBCLASS:

210+, for a process for treating a feed gas to remove a

constituent therefrom when there is no recovery of a desired material stemming from that component, even though a hydrogen sulfide component of the feed gas is converted to elemental sulfur and its recovery requires further processing, that is, the "more comprehensive claim" rule does not apply within a class.

220+, for a process for treating a feed gas containing hydrogen sulfide to modify or remove this component without recovery of hydrogen or sulfur-containing material therefrom.

572, for a process in which a sulfide compound is reacted with water vapor to form hydrogen sulfide which is then reacted to produce sulfur.