US PATENT SUBCLASS 501 / 73
.~.~.~ Less than 40 percent by weight silica

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


501 /   HD   COMPOSITIONS: CERAMIC

1  DF  CERAMIC COMPOSITIONS {15}
11  DF  .~ Glass compositions, compositions containing glass other than those wherein glass is a bonding agent, or glass batch forming compositions {11}
53  DF  .~.~ Silica containing {3}
73.~.~.~ Less than 40 percent by weight silica {2}
74  DF  .~.~.~.~> And lead {1}
77  DF  .~.~.~.~> And boron {2}

DEFINITION

Classification: 501/73

Less than 40 percent by weight silica:

(under subclass 53) Compositions containing silica in an amount equal to less than 40 percent by weight of the total composition.