Below 300 Degrees C Patents (Class 75/710)
- Involving mining or in situ operation (Class 75/712)
- From photography material (Class 75/713)
- From electrolytic or cementation slime (Class 75/714)
- Removing coating to recover free metal from substrate or coating (Class 75/715)
- Reducing to free metal with gas (Class 75/717)
- Utilizing organic reducing agent (Class 75/721)
- Involving organic compound containing metal or organic agent for agglomerating metal (Class 75/722)
- Displacing by another metal (i.e., electromotive series) (Class 75/724)
- Utilizing chemical agent to precipitate free metal (Class 75/739)
- Cleaning, leaching, or dissolving of Mercury(Hg) (Class 75/742)
- With leaching or dissolving (Class 75/743)