US PATENT SUBCLASS 536 / 70
.~.~.~.~.~.~ With pretreatment process


Current as of: June, 1999
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536 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
1.11  DF  .~ Carbohydrates or derivatives {15}
56  DF  .~.~ Cellulose or derivative {4}
58  DF  .~.~.~ Esters {3}
63  DF  .~.~.~.~ Carboxylic acid esters {5}
69  DF  .~.~.~.~.~ Acetates {3}
70.~.~.~.~.~.~ With pretreatment process {3}
71  DF  .~.~.~.~.~.~.~> Acetic acid utilized in pretreatment {2}
74  DF  .~.~.~.~.~.~.~> Sulfur containing compound utilized in pretreatment
75  DF  .~.~.~.~.~.~.~> Halogen containing compound utilized in process


DEFINITION

Classification: 536/70

(under subclass 69) Processes in which cellulose undergoes a physical or chemical treatment prior to the formation of the acetate ester.