US PATENT SUBCLASS 420 / 84
.~ Lead, bismuth, selenium, tellurium or calcium containing

Current as of: June, 1999
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420 /   HD   ALLOYS OR METALLIC COMPOSITIONS

8  DF  FERROUS (I.E., IRON BASE) {24}
84.~ Lead, bismuth, selenium, tellurium or calcium containing {1}
85  DF  .~.~> Processes {1}

DEFINITION

Classification: 420/84

Lead, bismuth, selenium, tellurium or calcium containing:

(under subclass 8) Alloy or metallic composition which additionally contains one or more of lead, bismuth, selenium, tellurium or calcium.

(1) Note. These elements are usually added to ferrous alloys in small amounts to improve the machinability of the alloy.