US PATENT SUBCLASS 29 / 890.051
.~.~ Boiler making

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

Internet Version by PATENTEC © 1999      Terms of Use


29 /   HD   METAL WORKING

592  DF  METHOD OF MECHANICAL MANUFACTURE {54}
890.03  DF  .~ Heat exchanger or boiler making {15}
890.051.~.~ Boiler making

DEFINITION

Classification: 29/890.051

Boiler making:

(under subclass 890.03) Process wherein the article made is especially useful for (1) generating steam or (2) heating water in a closed system for distribution of thermal energy.

(1) Note. Hot water heaters which are not closed systems are excluded from this subclass.