Paving system
US8104990B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Jan 19, 2006 |
| Grant date | Jan 31, 2012 |
| Priority date | — |
| Expiry date | Oct 3, 2027 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE01C3/003
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A paving system comprises an upper paving layer (1) permeable to liquid, and a substrate layer (7) of load bearing particulate material. Particles (10) of a non-load bearing, non-degradable porous foamed polymeric material are distributed in the interstitial spaces between particles (9) of the load bearing particulate material. The porous material may be an open celled phenolyic foam such as foamed phenol formaldehyde resin. The porous material absorbs water and also serves to retain microorganisms to break down pollutants. The system can be in fluid communication with the surrounding soil. Elements of the porous material may be used in lumps, which crumble under load into particles, which settle into the substrate layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.