US PATENT SUBCLASS 501 / 64
.~.~.~.~ And yttrium or rare earth (i.e., elements with atomic numbers 39 or 57-71)

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}
64.~.~.~.~ And yttrium or rare earth (i.e., elements with atomic numbers 39 or 57-71)

DEFINITION

Classification: 501/64

And yttrium or rare earth (i.e., elements with atomic numbers 39 or 57-71):

(under subclass 55) Compositions additionally containing yttrium or a rare earth in elemental or compound form.

(1) Note. Specifically included herein are compositions containing yttrium, lanthanium, cerium, praesodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, or lutecium in elemental or compound form.