US PATENT SUBCLASS 264 / 318
.~.~ Molding trapped undercut article portion

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

Internet Version by PATENTEC © 1999      Terms of Use


264 /   HD   PLASTIC AND NONMETALLIC ARTICLE SHAPING OR TREATING: PROCESSES

239  DF  MECHANICAL SHAPING OR MOLDING TO FORM OR REFORM SHAPED ARTICLE {10}
299  DF  .~ Shaping against forming surface (e.g., casting, die shaping, etc.) {10}
318.~.~ Molding trapped undercut article portion

DEFINITION

Classification: 264/318

(under subclass 299) Processes directed to the molding of articles of such irregular shape in rigid molds that portions of said articles and corresponding portions of the mold are in the relationship of an interference fit in that removal of said article from the mold cannot be accomplished be a straight line or unidirectional motion, except where the trapped portions of the article are at least temporarily flexible, elastic or resilient so as not to be broken or deformed from the desired shape by the confining portions of the mold if a straight line removal from the mold is employed.

(1) Note. This subclass will not take patents reciting the molding of articles which may have trapped undercut surfaces

in the mold but which by specific mold structure may be removed therefrom in a straightline or unidirectional motion. However, this subclass will take processes of forming articles of curved shapes in a rigid mold from which the shaped articles may be withdrawn without interference from the mold by a nonlinear motion corresponding to the curvature of said article such as the formation of threaded articles removed by an "unscrewing" operation.

SEE OR SEARCH THIS CLASS, SUBCLASS:

313+, for processes employing a flexible, deformable or destructible molding surface or material.

336, for processes of ejecting, stripping or separating formed articles from the mold before a full set or cure has taken place.