US PATENT SUBCLASS 29 / 890.053
.~.~ Tube making or reforming

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}
890.053.~.~ Tube making or reforming

DEFINITION

Classification: 29/890.053

Tube making or reforming:

(under subclass 890.03) Process wherein (1) the article made comprises an elongated hollow generally cylindrical member or (2) such an existing cylindrical member is reshaped.