US PATENT SUBCLASS 264 / 227
.~.~.~.~ Developing a surface negative and then a surface positive mold

Current as of: June, 1999
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264 /   HD   PLASTIC AND NONMETALLIC ARTICLE SHAPING OR TREATING: PROCESSES

219  DF  WITH STEP OF MAKING MOLD OR MOLD SHAPING, PER SE {1}
220  DF  .~ Utilizing surface to be reproduced as an impression pattern {4}
225  DF  .~.~ Forming mold from fluent material {1}
226  DF  .~.~.~ With initial molding or treating of a surface to be reproduced {1}
227.~.~.~.~ Developing a surface negative and then a surface positive mold

DEFINITION

Classification: 264/227

(under subclass 226) Processes which includes a formation of a negative of the surface to be reproduced followed by a formation of a positive surface which is to be used itself as a pattern or mold.