.~ Of silicon containing (not as silicon alloy) {6}
454
.~.~ Sand, clay or mica (silica excluded)
DEFINITION
Classification: 428/454
(under subclass 446) Product in which the silicon ingredient is sand*, clay* or mica*.
(1) Note. A patent claiming mica (as a constituent of a layer) will normally be considered to claim mica flakes* (flat) and will be placed in this class, subclass 324. Patents to a laminate of ground or pulverized mica will be placed in this subclass 454, unless the ground or pulverized mica is structurally defined to indicate placement in subclass 324.
SEE OR SEARCH THIS CLASS, SUBCLASS:
145, and 149+, for a product comprising a continuous but nonuniform or irregular surface, made by a layer of particulate matter which could be sand, silica or clay.
324, for a laminate comprising mica flakes; and see (1) Note. above.