US PATENT SUBCLASS 206 / 509
.~ Having vertical projecting element or recess for interlock

Current as of: June, 1999
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206 /   HD   SPECIAL RECEPTACLE OR PACKAGE

503  DF  STRUCTURAL FEATURES FOR VERTICAL STACKING, I.E., SIMILAR RECEPTACLES {5}
509.~ Having vertical projecting element or recess for interlock {3}
510  DF  .~.~> Handle type
511  DF  .~.~> Plural distinct feet or supports type
512  DF  .~.~> Corner lug or ear type

DEFINITION

Classification: 206/509

(under subclass 503) A container wherein the engaging structure includes either a distinct upward (downward) protuberance or upward (downward) opening cavity.

(1) Note. Often both a protuberance and a mating cavity are provided for stable piling of containers.