US PATENT SUBCLASS 502 / 421
.~.~.~ Including recycling product or intermediate thereof to prior stage of process

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

Internet Version by PATENTEC © 1999      Terms of Use


502 /   HD   CATALYST, SOLID SORBENT, OR SUPPORT THEREFOR: PRODUCT OR PROCESS OF MAKING

400  DF  SOLID SORBENT {6}
416  DF  .~ Free carbon containing {3}
418  DF  .~.~ Process utilizing solid or liquid source carbonizable material, or product thereof {9}
421.~.~.~ Including recycling product or intermediate thereof to prior stage of process

DEFINITION

Classification: 502/421

Including recycling product or intermediate thereof to prior stage of process:

(under subclass 418) Processes wherein at least a portion of a product is used in an earlier stage of the process.

(1) Note. This subclass does not include the use of products or intermediates as fuel in the process. See subclass 422.

SEE OR SEARCH THIS CLASS, SUBCLASS:

422, for use of part of source as fuel.