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| Number | Title | Issue Date |
| 3969844 | Soil treatment methods Culturing an alga with known flocculant production capability on the soil for the purposes of aggregating soil particles is disclosed. According to the disclosure, flocculant producing algae are known in liquid culture medium as disclosed in pending appli... | 07/20/1976 |
| 3959923 | Equipment for growing algae Water with algae and nutrients follow a meandering flow path, across which are established alternating, wide, dark and narrow, illuminating zones.... | 06/01/1976 |
| 3955317 | Method of growing plant cells Plant cells are grown continuously in a tubular transparent plastic structure through which water containing nutrients and carbon dioxide are passed. A suspension of plant cells in the water grow on exposure to light and can be harvested as a food materia... | 05/11/1976 |
| 3955318 | Waste purification system A method of producing an algae product and of purifying aqueous organic waste material to provide clean water. Starting algae and aqueous waste are admixed in sufficient amount to provide nutrients for the algae, which are grown in symbiotic relationship ... | 05/11/1976 |
| 3943659 | Filtration and circulation system and apparatus therefore A balanced system for purifying aquatic media and maintaining aquatic specimens which comprises biological filtration, mechanical filtration and algae propagation.... | 03/16/1976 |
