US PATENT SUBCLASS 585 / 625
.~.~.~.~.~.~ Ferrite

Current as of: June, 1999
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585 /   HD   CHEMISTRY OF HYDROCARBON COMPOUNDS

500  DF  UNSATURATED COMPOUND SYNTHESIS {14}
601  DF  .~ Diolefin product {4}
616  DF  .~.~ By dehydrogenation {3}
617  DF  .~.~.~ Using nonhydrocarbon acceptor {2}
621  DF  .~.~.~.~ Elemental O acceptor {2}
624  DF  .~.~.~.~.~ With metal oxide or hydroxide extraneous agent {2}
625.~.~.~.~.~.~ Ferrite

DEFINITION

Classification: 585/625

Ferrite:

(under subclass 624) Subject matter in which the agent is a compound of trivalent iron oxide with a basic oxide.

(1) Note. Ferrites are insoluble substances of spinel type which are prepared synthetically by fusion without water or occur in nature. The term "ferrite" is also applied to certain salts which contain tetra- and quinque-position iron, e.g., BaFeO3, which is a black powder formed when barium and ferric hydroxides are heated together in oxygen. See Miall et al., A New Dictionary Of Chemistry, 4th Edition, p. 239, Longman Group Limited, 1968.