Apparatus for fastening a corrugated sheet to a flat sheet
US3993428A · kind A · utility
7Cited by
5References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 1, 1973 |
| Grant date | Nov 23, 1976 |
| Priority date | — |
| Expiry date | Nov 1, 1993 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T156/1044
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A structure is described which consists of a corrugated and a flat sheet or film of thermoplastic material, which sheets are positively connected by matching depressions with undercuts arranged along the grooves of the corrugated sheet and at corresponding points of the flat sheets. The structure is especially suited to make inserts for trickling-filter towers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.