US PATENT SUBCLASS 501 / 63
.~.~.~.~ And phosphorus, niobium, or tantalum

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}
63.~.~.~.~ And phosphorus, niobium, or tantalum

DEFINITION

Classification: 501/63

And phosphorus, niobium, or tantalum:

(under subclass 55) Compositions additionally containing phosphorus, niobium, or tantalum or a compound of any of these elements.