US PATENT SUBCLASS 52 / 382
.~.~ Closed curvilinear cavity liner

Current as of: June, 1999
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52 /   HD   STATIC STRUCTURES (E.G., BUILDINGS)

380  DF  CAST IN SITU BARRIER CONSTRUCTION DEFINING ISOLATED SPACE {2}
381  DF  .~ Lined cavity formed within monolithic barrier material {1}
382.~.~ Closed curvilinear cavity liner

DEFINITION

Classification: 52/382

(under subclass 381) Structure in which the liner is curvilinear at least along a substantial section thereof, e.g., ball or cylinder.