US PATENT SUBCLASS 249 / 144
.~.~ Having inner and outer shells forming conduit-type product, receptacle-type product, or module

Current as of: June, 1999
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249 /   HD   STATIC MOLDS

117  DF  CONTAINER-TYPE MOLDING DEVICE {14}
142  DF  .~ And an inner removable core to form recess or opening {2}
144.~.~ Having inner and outer shells forming conduit-type product, receptacle-type product, or module {5}
145  DF  .~.~.~> Plural intersecting cores to produce product having intersecting passages
146  DF  .~.~.~> Including non-molding means engaging internal portion of core to retain core spaced throughout its length {2}
150  DF  .~.~.~> Inherently resilient core frictionally retained in position by its expansive or contractive force
151  DF  .~.~.~> Core slidably removably engaging a hole in the wall of the molding device
152  DF  .~.~.~> And means to expand or contract shell or core {1}

DEFINITION

Classification: 249/144

(under subclass 142) Apparatus comprising over-lapping inner and outer shells, the inner shell being a removable core for forming a recess in the product, the recess being in the nature of a through-passage for forming conduits, or hollow building structures of the module type, or a material retaining recess for forming receptacles.

(1) Note. To constitute a removable element of the mold, the element must be detachable from the mold and shape only an internal surface of the finished product.

SEE OR SEARCH CLASS

52, Static Structures (e.g., Buildings), appropriate subclasses for formed products of the type formed by the molds of this and indented subclasses.