Imaging material comprising a layer which comprises deformed particulate organic polymeric material such as flattened spheres, which has a memory for its original particulate shape and which is capable of recovering its original particulate shape upon the application of energy above a certain threshold....http://www.google.fr/patents/US4103044?utm_source=gb-gplus-shareBrevet US4103044 - Method for storage of retrievable information dispersion imaging material and method
Method for storage of retrievable information dispersion imaging material ...
