US PATENT SUBCLASS 420 / 442
.~ Chromium containing

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

441  DF  NICKEL BASE {6}
442.~ Chromium containing {5}
443  DF  .~.~> Rare earth, magnesium or alkaline earth metal containing
444  DF  .~.~> Noble metal containing
445  DF  .~.~> Aluminum containing {1}
451  DF  .~.~> Titanium containing
452  DF  .~.~> Iron or manganese containing {1}

DEFINITION

Classification: 420/442

Chromium containing:

(under subclass 441) Alloy, or metallic composition which additionally contains chromium.

(1) Note. This and indented subclasses contain many patents to so called "superalloys" which retain considerable strength at high temperatures and which are therefor particularly useful as components in gas turbine engines.