Security features in paper
US4552617A · kind A · utility
38Cited by
2References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 13, 1984 |
| Grant date | Nov 12, 1985 |
| Priority date | — |
| Expiry date | Jun 13, 2004 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H21/44
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Security features for authentification of currency paper are incorporated within the paper during the paper making process. Various codes are incorporated within the paper for viewing by means of transmitted light. In one embodiment the identifying indicia is microprinted on thin strips of a carrier material which dissolves during the dewatering and drying stage of the paper making process. The microprinted indicia remains intact and is readable by means of transmitted light yet is neither legible nor reproductible with reflected light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.