US PATENT SUBCLASS 501 / 56
.~.~.~.~ And halogen or nitrogen

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}
55  DF  .~.~.~ 40 percent - 90 percent by weight silica {7}
56.~.~.~.~ And halogen or nitrogen {1}
57  DF  .~.~.~.~.~> Fluorine {1}

DEFINITION

Classification: 501/56

And halogen or nitrogen:

(under subclass 55) Compositions additionally containing a halogen or nitrogen or a compound of either.