| Application number | Title of the application | Filing Date | Status |
|---|
| 06/325094 | DEBRIS SEPARATOR UNIT FOR RAINGUTTER DOWNSPOUTS | Nov 24, 1981 | Abandoned |
| 06/323592 | EFFLUENT TREATMENT | Nov 19, 1981 | Abandoned |
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| 06/310527 | GRAVITY FED WATER TREATMENT APPARATUS | Oct 12, 1981 | Abandoned |