US PATENT SUBCLASS 29 / 890.146
.~.~ Trap making

Current as of: June, 1999
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29 /   HD   METAL WORKING

592  DF  METHOD OF MECHANICAL MANUFACTURE {54}
890.14  DF  .~ Gas and water specific plumbing component making {9}
890.146.~.~ Trap making

DEFINITION

Classification: 29/890.146

Trap making:

(under subclass 890.14) Process wherein the manufactured article is especially useful in a fluid system for preventing

the passage of sewer gas or noxious effluent gas while allowing other material and fluid to proceed therethrough.

(1) Note. A trap generally consists of a bend or partitioned chamber in which the liquid forms a seal to prevent passage of the undesired gas.