US PATENT SUBCLASS 404 / 31
.~.~ Plural layers

Current as of: June, 1999
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404 /   HD   ROAD STRUCTURE, PROCESS, OR APPARATUS

17  DF  PAVEMENT {9}
27  DF  .~ Including bed {2}
31.~.~ Plural layers

DEFINITION

Classification: 404/31

(under subclass 27) Bed structure comprising two or more strata.

(1) Note. The tendency of one stratum to merge into another will not exclude classification in this subclass where such separate strata are in fact set out or recognized.

SEE OR SEARCH CLASS

156, Adhesive Bonding and Miscellaneous Chemical Manufacture,

71, and 276 for road layers using an adhesive.