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| 9021619 | Manhole odor eliminator | Mar 08, 12 | May 05, 15 | INVENTIVE RESOURCES, INC |
| 8926739 | Portable gas scrubber with sensor | Oct 11, 12 | Jan 06, 15 | Not available |
| 8851791 | Manhole cover venting and precipitation guarding devices | Sep 11, 13 | Oct 07, 14 | Not available |
| 8834613 | Bad odor removal system for sewage pipe | Oct 07, 11 | Sep 16, 14 | SCENTEC INC. |
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| 7883290 | Manhole security barrier | Apr 14, 08 | Feb 08, 11 | ROSS, BRENDA |
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| 5645099 | Sewer relief valve | Jul 08, 96 | Jul 08, 97 | Eaton; Dean L., STEELE, MICHAEL, |
| 5295535 | Cover for an observation well | Apr 13, 92 | Mar 22, 94 | The Boles Company, Inc. |
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| 4962548 | Valve assembly | Sep 07, 88 | Oct 16, 90 | G.I. Marketing CC, G I MARKETING CC, 4 BECKER ROAD, CLAYVILLE, MIDRAND, TRANSVAAL, SOUTH AFRICA, |
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