The innovation is attributed to the new spiro-condensed pyran compounds which have improved photochromic properties and can be used as molecular photocouplers.
Novelty:
New compounds, new synthesis method, very fast photochromes resistant to oxidation in air.
Patenting:
LR patent LT6024 B, announcement date: 2014-04-25
EP patent EP2718393B1; announcement date: 2015-08-05
