|
| US4037007 | 30 juil. 1975 | 19 juil. 1977 | Portals Limited | Document authentification paper |
| US4136229 | 25 oct. 1977 | 23 janv. 1979 | Societe Anonyme dite: Arjomari-Prioux | Security paper |
| US4190056 | 31 oct. 1977 | 26 févr. 1980 | General Medical Company | Method and means for recording sweat gland activity |
| US4232083 | 22 juil. 1975 | 4 nov. 1980 | Minnesota Mining and Manufacturing Company | Imaging compositions and methods |
| US4528543 | 30 mars 1984 | 9 juil. 1985 | Sharp Kabushiki Kaisha | Moisture sensitive resistive element |
| US4529642 | 30 mars 1984 | 16 juil. 1985 | Sharp Kabushiki Kaisha | Moisture sensitive resistive element |
| US4880750 | 9 juil. 1987 | 14 nov. 1989 | Miragen, Inc. | Individual-specific antibody identification methods |
| US4902571 | 15 mai 1984 | 20 févr. 1990 | Sharp Kabushiki Kaisha | Moisture sensitive resistive element |
| US6060108 | 28 août 1998 | 9 mai 2000 | Preservation Technologies, L.P. | Method for revealing hidden watermarks |
| US6783991 | 6 févr. 2002 | 31 août 2004 | The Standard Register Company | Reversible and reusable authentication system for secure documents |