US PATENT SUBCLASS 228 / 17.7
.~.~ Helical 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  DF  .~ Comprising means forming one-piece blank into a tubular shape {1}
17.7.~.~ Helical tubular shape

DEFINITION

Classification: 228/17.7

(under subclass 17.5) Device including means to shape or

distort a long attenuated web into a tubular coil to juxtapose the faces of opposite side edges along a line running spirally axially along the tube so formed, and means for bonding the resulting seam.

SEE OR SEARCH THIS CLASS, SUBCLASS:

145, for the method of forming a helically bonded tube.