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Intangible assets
 6 Months Ended
Jun. 30, 2025
Intangible assets other than goodwill [abstract]  
Intangible assets Intangible assets
The change in intangible assets breaks down as follows:
(in thousands of euros)As of December 31, 2024IncreasesDecreases
Transfer
As of June 30, 2025
Patents65 7 — — 72 
Software669 1 — — 669 
Gross book value of intangible assets734 8 — — 742 
Patents(65)— — — (65)
Software(662)(2)— — (663)
Accumulated depreciation of intangible assets (1)(727)(2)— — (729)
Net book value of intangible assets7 6 — — 13 
(1)Expenses for the period are detailed in Note 17.4 Depreciation, amortization and provisions expenses
No impairment losses were recognized in application of IAS 36 - Impairment of Assets in the period presented.