Simulated watermark printing system
US4919044A · kind A · utility
5Cited by
7References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 5, 1988 |
| Grant date | Apr 24, 1990 |
| Priority date | — |
| Expiry date | Dec 5, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41M3/10
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A wet laid watermark of uncoated paper is simulated by the use of a resin or resin-plasticizer mixture dissolved in a slow evaporating, high boiling solvent. A sufficient quantity of the low viscosity solution is printed onto an uncoated paper sheet of stationery grade by a standard flexographic press to penetrate the paper fiber and deposit a non-tacky solid having a refractive index which closely approximates that of cellulose. The resulting image of the print is visible to both faces of the paper sheet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.