US PATENT SUBCLASS 558 / 464
.~.~.~.~.~ Utilizing ion exchange resin, or a silicon, aluminum, or heavy metal containing material

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

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {21}
303  DF  .~ Nitriles (i.e., compounds having cyano bonded directly to carbon, which carbon may be single bonded to any atom but may be multiple bonded only to carbon) {21}
435  DF  .~.~ Acyclic (e.g., purification of saturated nitriles, etc.) {9}
462  DF  .~.~.~ Carbon to carbon unsaturation containing {1}
463  DF  .~.~.~.~ Purification or recovery {3}
464.~.~.~.~.~ Utilizing ion exchange resin, or a silicon, aluminum, or heavy metal containing material

DEFINITION

Classification: 558/464

(under subclass 463) Processes which utiltze a material that contains silicon, aluminum, or a metal having specific gravity greater than four, or which utilize an ion exchange resin.

(1) Note. Arsenic is considered a metal.