Security document
US4763927A · kind A · utility
45Cited by
11References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 7, 1985 |
| Grant date | Aug 16, 1988 |
| Priority date | — |
| Expiry date | Jun 7, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24942
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
In order to increase the protection against forgery of a security paper, a security inlay made of polymer material having piezoelectric and/or pyroelectric properties is embedded in the security paper. The presence of such an inlay can be tested by means of contacting and non-contacting measuring methods.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.