US PATENT SUBCLASS 420 / 8
FERROUS (I.E., IRON BASE)

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

8FERROUS (I.E., IRON BASE) {24}
9  DF  .~> 1.7 percent or more carbon containing {2}
34  DF  .~> Nine percent or more chromium containing {14}
72  DF  .~> Eight percent or more manganese containing {4}
77  DF  .~> Four percent or more aluminum containing {4}
82  DF  .~> Noble metal containing
83  DF  .~> Rare earth metal containing
84  DF  .~> Lead, bismuth, selenium, tellurium or calcium containing {1}
87  DF  .~> Over 0.05 percent sulfur, over 0.04 percent phosphorus or sulfur or phosphorus added in any amount to promote machinability {1}
89  DF  .~> Copper containing {3}
94  DF  .~> Over 10 percent nickel containing {4}
99  DF  .~> One percent or more carbon containing, but less than 1.7 percent {1}
103  DF  .~> Over 0.1 percent aluminum containing, but less than 4 percent
104  DF  .~> Chromium containing, but less than 9 percent {4}
117  DF  .~> Two percent or more silicon containing {1}
119  DF  .~> Nickel containing, but 10 percent or less
120  DF  .~> 1.5 percent or more manganese containing, but less than 8 percent
121  DF  .~> Boron containing
122  DF  .~> Tungsten containing
123  DF  .~> Molybdneum containing {1}
125  DF  .~> Zirconium containing
126  DF  .~> Titanium containing
127  DF  .~> Vanadium, tantalum or niobium containing
128  DF  .~> Nitrogen containinig
129  DF  .~> Processes

DEFINITION

Classification: 420/8

Ferrous (i.e., iron base):

(under the class definition) Alloy or metallic composition containing over 50 percent of iron.

(1) Note. This and indented subclasses will take so called ferralloys e.g., ferrosilicon, etc., where the percentage of iron is not specified. Where there are indented subclasses hereunder which provide for different percentages of alloying ingredient e.g., chromium, the patent is classified in the subclass providing for the largest percentage of alloying ingredient in the absence of recitations that a smaller percentage is present.