US PATENT SUBCLASS 502 / 24
.~.~ Including intended dissolution or precipitation of a substantial amount of an ingredient of the ultimate composition

Current as of: June, 1999
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502 /   HD   CATALYST, SOLID SORBENT, OR SUPPORT THEREFOR: PRODUCT OR PROCESS OF MAKING

20  DF  REGENERATING OR REHABILITATING CATALYST OR SORBENT {4}
22  DF  .~ Treating with a liquid or treating in a liquid phase, including dissolved or suspended {5}
24.~.~ Including intended dissolution or precipitation of a substantial amount of an ingredient of the ultimate composition

DEFINITION

Classification: 502/24

Including intended dissolution or precipitation of a substantial amount of an ingredient of the ultimate composition:

(under subclass 22) Process in which an essential component of the composition is (1) dissolved in a solvent or by reaction, or (2) caused to come out of solution in a solid phase, permitting separation from reaction products and/or extraneous material or providing such component in an effective form.

(1) Note. The subject matter of this subclass requires an intentional dissolution of a component of the composition and does not include incidental etching of an active material during an acid treating to clean the metal surface.

(2) Note. A process in which additional active material may be added by precipitation is not proper for this subclass. The material precipitated must have been present in the original catalyst composition, though possibly in a different form.