Liquid drainage unit
US6854924B2 · kind B2 · utility
11Cited by
6References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 25, 2002 |
| Grant date | Feb 15, 2005 |
| Priority date | — |
| Expiry date | Sep 25, 2022 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE03F1/002
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A pre-assembled drainage line unit includes a flexible longitudinally extending perforated sleeve member and a loose aggregation of lightweight elements contained within the sleeve member. A pliable, water permeable barrier material extends along the sleeve member and overlies at least a portion of the aggregation to prevent the passage of solid materials, such as sand and dirt, into the aggregation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.