US PATENT SUBCLASS 420 / 34
.~ Nine percent or more chromium containing

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

8  DF  FERROUS (I.E., IRON BASE) {24}
34.~ Nine percent or more chromium containing {14}
35  DF  .~.~> Noble metal containing
36  DF  .~.~> Cobalt containing {1}
40  DF  .~.~> Rare earth containing
41  DF  .~.~> Lead, bismuth, antimony, calcium, selenium or tellurium containing
42  DF  .~.~> Over 0.05 percent sulfur, over 0.04 percent phosphorus or sulfur or phosphorus added in any amount to promote machinability
43  DF  .~.~> Eight percent or more nickel containing {6}
56  DF  .~.~> Eight percent or more total nickel plus manganese containing {3}
60  DF  .~.~> Copper containing {1}
62  DF  .~.~> Over 0.1 percent aluminum containing {1}
64  DF  .~.~> Boron containing
65  DF  .~.~> 0.25 percent or more nitrogen containing {1}
67  DF  .~.~> Molybdenum or tungsten containing {2}
70  DF  .~.~> Group IV or V transition metal containing
71  DF  .~.~> Processes

DEFINITION

Classification: 420/34

Nine percent or more chromium containing:

(under subclass 8) Alloy or metallic composition which additionally contains 9 percent or more of chromium.

(1) Note. Many of the alloys classified in this and indented subclasses are called "stainless steel" because the presence of 9 percent or more chromium makes an iron base alloy relatively resistant to corrosion. The recitation that a ferrous alloy is a "stainless steel" will prima facie be taken is meaning that the alloy is properly classified in this or indented subclass in absence of a specific indication that the alloy does not contain 9 percent or more chromium.