Stock Patents (Class 148/400)
- 1.7 percent or more carbon containing (e.g., cast iron) (Class 148/321)
- Nine percent or more chromium containing (Class 148/325)
- Age or precipitation hardened or strengthed (Class 148/328)
- Eight percent or more manganese containing (Class 148/329)
- Beryllium or boron containing (Class 148/330)
- Rare earth meal containing (Class 148/331)
- Copper containing (Class 148/332)
- Chromium containing, but less than 9 percent (Class 148/333)
- Nickel containing (Class 148/336)
- Three percent or more manganese containing or containing other transition metal in any amount (Class 148/337)