US PATENT SUBCLASS 501 / 21
.~.~.~ Chemically specified frit compositions

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}
14  DF  .~.~ Enamels, glazes, or fusion seals (e.g., raw, fritted, or calcined ingredients) {4}
21.~.~.~ Chemically specified frit compositions {4}
22  DF  .~.~.~.~> Lead containing {1}
24  DF  .~.~.~.~> Phosphorous containing
25  DF  .~.~.~.~> Halogen containing
26  DF  .~.~.~.~> Zinc containing

DEFINITION

Classification: 501/21

Chemically specified frit compositions:

(under subclass 14) Compositions which are in a powdered or comminuted form, defined in terms of their chemical content.