US PATENT SUBCLASS 501 / 50
.~.~.~.~ And yttrium or rare earth (i.e., elements with atomic numbers 39, 57-71, or 89+)

Current as of: June, 1999
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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}
41  DF  .~.~ Nonsilicate oxide glasses {4}
49  DF  .~.~.~ Boron containing {2}
50.~.~.~.~ And yttrium or rare earth (i.e., elements with atomic numbers 39, 57-71, or 89+) {1}
51  DF  .~.~.~.~.~> And zirconium, titanium, tantalum, or niobium

DEFINITION

Classification: 501/50

And yttrium or rare earth (i.e., elements with atomic numbers 39, 57-71, or 89+):

(under subclass 49) Compositions additionally containing yttrium or a rare earth in elemental or compound form.

(1) Note. Included herein are compositions including yttrium, lanthanide, actinide, or transactinide elements or compounds of any such elements. Specifically included are yttrium, lanthanium, cerium, praesodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutecium,

actinium, thorium, protoactinium, uranium, neptunium, and plutonium.