Tamper-evident closure comprising a RFID tag

1. A tamper-evident closure for a container neck, the tamper-evident closure comprising:

a first portion, and a second portion comprising a window through which a view of the first portion is visible;

the second portion rotatable relative to the first portion upon first opening of the tamper- evident closure, in a first direction of rotation, from a first position in which the first and second portions are in a first relative relation to a second position in which the first and second portions are in a second relative relation; and

a locking mechanism for irreversibly locking the first and second portions in the second relative relation;

rotation of the second portion relative to the first portion causes rotation of the window relative to the first portion,

a first view of the first portion is visible through the window when the first and second portions are in the first relative relation, and

a second, different view of the first portion is visible through the window when the first and second portions are in the second relative relation;

wherein the tamper-evident closure further comprises an RFID device associated with the first portion,

the RFID device is aligned with the window of the second portion when the first and second portions are in the first relative relation and is readable, and

the RFID device is masked by the second portion when the first and second portions are in the second relative relation and is not readable;

whereby the readability of the RFID device is irreversibly blocked during first opening of the tamper-evident closure,

further comprising a second RFID device associated with the first portion,

when the first and second portions are in the first relative relation, the RFID device is aligned with the window of the second portion and is readable and the second RFID device is masked by the second portion and is not readable, and

when the first and second portions are in the second relative relation, the RFID device is masked by the second portion and is not readable and the second RFID device is aligned with the window of the second portion and is readable;

whereby the readability of the RFID device and of the second RFID device is irreversibly changed during first opening of the tamper-evident closure.

2. The tamper-evident closure of claim 1 , wherein, during first opening of the tamper-evident closure, the locking mechanism irreversibly locks the first portion and the second portion in the second relative relation and thereafter the first and second portions are removable together.

3. The tamper-evident closure of claim 1 , wherein the second portion comprises a shell in which the window is defined.

4. The tamper-evident closure of claim 3 , wherein the shell comprises a top plate and a side skirt and the window is defined in the side skirt.

5. The tamper-evident closure of claim 4 , wherein the window is one of: an aperture, a cut-out.

6. The tamper-evident closure of claim 3 , wherein the shell comprises aluminium.

7. The tamper-evident closure of claim 3 , wherein the first portion comprises a sleeve, the sleeve comprising a first zone provided with the RFID device and the sleeve comprising a second zone that differs from the first zone.

8. The tamper-evident closure of claim 7 , wherein the sleeve comprises a plastics material.

9. The tamper-evident closure of claim 1 , wherein the locking mechanism comprises a ratchet arrangement.

10. The tamper-evident closure of claim 9 , wherein the locking mechanism comprises an inner ratchet element and an outer ratchet element, the first portion comprises the inner ratchet element and the second portion comprises the outer ratchet element.

11. The tamper-evident closure of claim 1 , comprising a first part, and a second part,

when the first and second portions are in the first relative relation, prior to first opening of the tamper-evident closure, the first and second parts are adjacent one another, and

when the first and second portions are moved into the second relative relation, during first opening of the tamper-evident closure, an irreversible gap is generated between the first and second parts.

12. The tamper-evident closure of claim 11 , wherein the first and second parts are upper and lower shell parts.

13. The tamper-evident closure of claim 11 , wherein the gap is unobstructed.

14. The tamper-evident closure of claim 1 , wherein the first portion is removably engageable with a body portion for fixing to a container neck.

15. The tamper-evident closure of claim 1 , wherein the window comprises more than one opening.

16. The tamper-evident closure of claim 1 , wherein said second RFID device is an NFC tag.

17. A container neck provided with the tamper-evident closure of claim 1 .