US PATENT SUBCLASS 502 / 25
.~.~ Using salt or alkaline substance

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}
25.~.~ Using salt or alkaline substance {1}
26  DF  .~.~.~> Ammonia or derivative thereof

DEFINITION

Classification: 502/25

Using salt or alkaline substance:

(under subclass 22) Process in which the material utilized is capable of supplying a nonprotonic positive ion.

(1) Note. The treating material of the subclass generally gives a basic or neutral pH, but may include soaps (salts of carboxylic acids) and acid salts (e.g., NaHSO4, CaHPO4).

(2) Note. The use of a base to neutralize a previous acid treatment is provided for in this subclass.