US PATENT SUBCLASS 425 / 320
.~ Convoluting means includes an endless surface

Current as of: June, 1999
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425 /   HD   PLASTIC ARTICLE OR EARTHENWARE SHAPING OR TREATING: APPARATUS

319  DF  MEANS TO FORM PREFORM FROM BULK AND MEANS TO CONVOLUTE OR TWIST THE PREFORM {1}
320.~ Convoluting means includes an endless surface {2}
321  DF  .~.~> Convoluting means includes two or more endless surfaces
322  DF  .~.~> Convoluting means includes a roll

DEFINITION

Classification: 425/320

(under subclass 319) Apparatus where the convoluting or twisting means includes at least one endless surface in direct contact with the material being reshaped.

(1) Note. A mandrel which serves as a form around which a preform is wound to form an article containing a cavity corresponding to the shape of the mandrel, (e.g.., tube or hollow cane forming, etc..), is not found here, but is proper for subclass 319.