Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filedfiledCritical
Application grantedgrantedCritical
Publication of FR551615ApublicationCriticalpatent/FR551615A/fr
Procédé de sûreté pour l'impression de tous papiers de valeur tels qu'obligations, actions, titres, billets de banque, etc., basé sur l'emploi d'empreintes digitales
Procédé photochimique pour l'obtention de formes d'impression destinées à l'impression directe ou indirecte, en particulier d'après des originaux non transparents