Construction laminate of plastic foam between paper sheets
US4032689A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 14, 1975 |
| Grant date | Jun 28, 1977 |
| Priority date | — |
| Expiry date | Oct 14, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249965
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A construction element having a high strength to weight ratio, particularly useful in the fabrication of a boat hull, the construction element comprising: PA1 A first face layer of resin impregnated glass fiber cloth or glass fiber matting; PA1 An intermediate stiffening member comprising a laminate of: PA2 A. a flexible top sheet, preferably of paper; PA2 B. an intermediate foam layer, bonded to the top sheet; and PA2 C. a flexible bottom sheet, preferably of paper, bonded to the intermediate foam layer on the side opposite the top paper sheet; the laminate having: PA3 I. a first series of spaced slits extending through the top sheet and intermediate foam layer but not through the bottom sheet; PA3 Ii. a second series of spaced slits parallel to the first series of spaced slits and extending through the bottom sheet and intermediate foam layer but not through the top sheet, the second series of spaced slits being offset from the first series of spaced slits; PA3 Iii. a third series of spaced slits perpendicular to the first and second series of spaced slits, the third series of spaced slits extending through the top sheet and intermediate foam layer but not through the bottom shee…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.