Rotationally moulded septic tank sleeves
US4717040A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 15, 1987 |
| Grant date | Jan 5, 1988 |
| Priority date | — |
| Expiry date | Apr 15, 2007 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE03F11/00
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A one-piece or sectional access sleeve for septic tanks is rotationally moulded as a single tube with covers formed at one or both ends. These covers are parted-off and trimmed and engage the upper open end of the sleeve in sealed, twist-locking relationship. In the sectional sleeve, portions or sections can be parted off at specific locations along the length thereof and can either receive covers as mentioned above or can be engaged upon the upper end of another section and twist-locked into sealing relationship so that the necessary length of access sleeve is easily assembled for field attachment and access to the tank, from the surface, regardless of the depth of the tank below the ground surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.