US PATENT SUBCLASS 423 / 700
ZEOLITE

Current as of: June, 1999
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423 /   HD   CHEMISTRY OF INORGANIC COMPOUNDS

700ZEOLITE {7}
701  DF  .~> Organic compound used to form zeolite {1}
709  DF  .~> Seed used
710  DF  .~> Aging to induce zeolite formation from inorganic mixture {1}
712  DF  .~> Synthesized from naturally occurring product
713  DF  .~> Isomorphic metal substitution {1}
716  DF  .~> With change of synthesized zeolite morphology {1}
718  DF  .~> Structure defined X-ray diffraction pattern

DEFINITION

Classification: 423/700

ZEOLITE:

(under the class definition) Products or processes of making wherein the product is zeolite.

(1) Note. Included in this subclass are zeolites, as defined in Class 502, having ion exchange properties, generally represented by the following formula:0.8 - 1.0 M2O : Y2O3 : n XO2 : b H2O where M is an ion exchangeable cation; X is an element of valence +4; Y is an element of valence +3; n is a number greater than 1; and b is the number of moles of water (typically in a range of 1-500). This class of compounds is considered to be particular enough so that the (13) Note in the main class definition does not apply, and these zeolite substances will be considered compounds for Class 423.

The rationale behind this consideration is that zeolites may be interpreted either as a range of values or as specifically defined values, though in a form of decimal or fractional amounts, these formulas designate a definite compound or complex. This class of compounds, zeolites, are considered

products for Class 423, unless mixed with an additive whose function is not solely to perfect the product, see (6) Note of subclass 265.

(2) Note. Zeolites include crystalline structures having an additional property of being molecular sieves, i.e., having a uniform pore size; however, carbon based "molecular sieves" such as graphite intercalation compounds, coals, and polymers are excluded from this subclass.

(3) Note. The term "zeolite" has also been used to designate other substances such as organic resins which ion exchange with other substances; comments of (1) Note are intended to apply only to crystalline inorganic compounds.

SEE OR SEARCH THIS CLASS, SUBCLASS:

327.1+, for amorphous and layered aluminosilicates, clays, and feldspars. SEE OR SEARCH CLASS

502, Catalyst, Solid Sorbent, or Support Therefor: Product or Process of Making, appropriate subclasses for zeolites specifically structured to catalyze or sorb a component.