US PATENT SUBCLASS 501 / 70
.~.~.~.~.~.~ Calcium oxide containing

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}
53  DF  .~.~ Silica containing {3}
55  DF  .~.~.~ 40 percent - 90 percent by weight silica {7}
68  DF  .~.~.~.~ And aluminum or iron compound {1}
69  DF  .~.~.~.~.~ And divalent metal oxide (e.g., oxides of zinc, cadmium, beryllium, alkaline earth metal, magnesium, etc.) {1}
70.~.~.~.~.~.~ Calcium oxide containing {1}
71  DF  .~.~.~.~.~.~.~> And chromium, nickel, or cobalt

DEFINITION

Classification: 501/70

Calcium oxide containing:

(under subclass 69) Compositions in which the divalent metal oxide is calcium oxide.

(1) Note. This subclass takes, for example, many glass compositions which are identified as common sheet or container glass, such as the well known soda-lime glasses.