US PATENT SUBCLASS 228 / 17.5
.~ Comprising means forming one-piece blank into a tubular shape

Current as of: June, 1999
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228 /   HD   METAL FUSION BONDING

15.1  DF  WITH MEANS TO DEFORM WORK, FILLER, OR FLUX PORTION BEFORE FUSION {3}
17.5.~ Comprising means forming one-piece blank into a tubular shape {1}
17.7  DF  .~.~> Helical tubular shape

DEFINITION

Classification: 228/17.5

(under subclass 15.1) Device including means to shape or distort a single generally planar part to a cylindrical configuration and means to surface bond the meeting faces thereof.

SEE OR SEARCH THIS CLASS, SUBCLASS:

144+, for the method of uniting the margins of a one-piece blank.