Patent ID: 9701151
Date: 2017-07-11
CPC Classifications: B42D,D21H,Y10T

Claim:
1. A security thread having a longitudinal axis, said thread configured to be incorporated into a security document, comprising: at least two zones located respectively on either side of a separation line extending along a direction parallel to the longitudinal axis; a first optically variable security element in the first zone; and a second optically variable security element in the second zone, the first and second zones and the first and second elements each being at a distance from the separation line, a neutral zone being defined between said first and second security zones, the first and second security elements being arranged so that for a first direction of observation, the first and second elements have different appearances from one another and for a second direction of observation, different from the first direction of observation, the first and second elements have: wherein the security thread comprises a third security element extending along a direction parallel to the longitudinal axis of the security thread, the third security element being located at least partially within the neutral zone, when the thread is observed from the front.