Method for the manufacture of a material in the form of sheets or a web provided with a watermarklike pattern
US4720325A · kind A · utility
13Cited by
3References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 22, 1986 |
| Grant date | Jan 19, 1988 |
| Priority date | — |
| Expiry date | Jan 22, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2701/1912
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A material (1) in the form of sheets or a web is provided with a watermarklike pattern (12) in the form of a text, figure or similar identification mark visible or displayable in transmitted light by means of relieflike mechanical working off of material, for example grinding, milling etc., corresponding to the desired pattern (12).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.