Marked multi-ply paper sheets and method and equipment for their manufacture
US5443889A · kind A · utility
20Cited by
2References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 20, 1993 |
| Grant date | Aug 22, 1995 |
| Priority date | — |
| Expiry date | Oct 20, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31982
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A paper sheet having several distinct layers comprised of at least two plies of paper glued together in discrete areas and characterized by having patterns which correspond to areas of reduced thickness on both outer surfaces of the plies of paper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.