Board element
US4188428A · kind A · utility
Inventor
Key dates
| Filing date | Mar 24, 1978 |
| Grant date | Feb 12, 1980 |
| Priority date | — |
| Expiry date | Mar 24, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24996
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A lightweight board element includes a lightweight core, such as rigid plastic foam, and a covering layer such as glass fiber-reinforced resin. The upper and lower surfaces of the core are provided with a grid pattern made of up narrow grooves for improving stiffness and surface strength. The lower surface is provided with a further grid pattern of wider grooves which offer improved resistance to distortion. The cover layer is bonded to the core in a mold and the cover layer extends over the side edges of the core. The board uses relatively inexpensive materials and has excellent properties. The board element is particularly suited to the fabrication of a table tennis table in which case the grid pattern of narrow grooves in the upper core surface provides excellent ball bounce characteristics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.