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| Number | Title | Issue Date |
| 6319403 | Effluent filter for septic tanks and other on-site waste disposal systems An effluent filter for septic tanks and the like has substantially horizontal filtering levels provided in a stepped arrangement on both an inlet side and an outlet side of the effluent filter. The effluent filter provides an array of both substantially h... | 11/20/2001 |
| 5852901 | Stackable riser for on-site waste and drainage systems A plastic stackable riser for providing a grade level access for underground components such as septic tanks, distribution boxes, and drop boxes, including a cylindrical side wall having a top free edge and a bottom edge. The top free edge defines a first... | 12/29/1998 |
| 5711536 | Seal component for use in on-site poured concrete or plastic tank or box components of fluid distribution systems An improved multi-function seal component for use in the walls of poured concrete or plastic tank or box components of fluid distribution systems is disclosed. The seal component includes a cylindrical wall member, an angled frustro-conical wiper blade wh... | 01/27/1998 |
| 5624123 | Pipe seal assembly for poured concrete on-site waste disposal system components An improved pipe seal assembly for use in the walls of a poured concrete tank or box in an on-site waste disposal system, a drainage system, and other poured concrete structures, the assembly including a seal member having an inclined, frusto-conical shap... | 04/29/1997 |
| 5617679 | Stackable riser for on-site waste and drainage systems A plastic stackable riser for providing a grade level access for underground components such as septic tanks, distribution boxes, and drop boxes, is disclosed. The stackable riser includes a continuous peripheral side wall having a top free edge and a bot... | 04/08/1997 |
| 5529436 | Trench drain system An improved trench drain or so-called channel drain system is disclosed which provides a universal drainage unit, preferably formed of injection molded plastic in a standard length, for installation in concrete floors, airport areas, driveways, service st... | 06/25/1996 |
| 5370426 | Pipe connector for connecting to a hard plastic pipe A flexible pipe connector is disclosed for connecting to a hard plastic pipe. The flexible pipe connector, preferably made of polyethylene, has a tubing member which defines a cylindrical wall with inner and outer surfaces, the cylindrical wall having a m... | 12/06/1994 |
| 5335945 | Flexible pipe connector A flexible pipe connector is disclosed having two female ends, each for receiving a length of corrugated pipe and creating a gravity flow water-tight seal between the two lengths of corrugated pipe. The flexible pipe connector is made of flexible, stretch... | 08/09/1994 |
| 5336351 | Method for connecting a pipe connector to a hard plastic pipe A flexible pipe connector is disclosed for connecting to a hard plastic pipe. The flexible pipe connector, preferably made of polyethylene, has a tubing member which defines a cylindrical wall with inner and outer surfaces, the cylindrical wall having a m... | 08/09/1994 |
