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| Number | Title | Issue Date |
| 6204396 | Method for producing calcium fulvate from humus material A method produces calcium fulvate from naturally-occurring humus material, such as leonardite, or humic shales. The humus material containing solid fulvic acid and solid humic acid is mixed with water and sodium hydroxide for a first selected period of ti... | 03/20/2001 |
| 6147229 | Method for producing magnesium fulvate from humus material A method produces magnesium fulvate from naturally-occurring humus material, such as leonardite, or humic shales. The humus material containing solid fulvic acid and solid humic acid is mixed with water and sodium hydroxide for a first selected period of ... | 11/14/2000 |
