US PATENT SUBCLASS 428 / 439
.~.~.~ Cellulosic ester

Current as of: June, 1999
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428 /   HD   STOCK MATERIAL OR MISCELLANEOUS ARTICLES

411.1  DF  COMPOSITE (NONSTRUCTURAL LAMINATE) {25}
426  DF  .~ Of quartz or glass {9}
438  DF  .~.~ Next to cellulosic {1}
439.~.~.~ Cellulosic ester

DEFINITION

Classification: 428/439

(under subclass 438) Product in which the cellulosic material has been esterfied by reaction with an acid.

(1) Note. A patent claiming glass laminated to nitro-cellulose or cellulose nitrate, cellulose chromate or cellulose sulfate, as well as cellulose acetate, butyrate etc., will be placed in this subclass.