In a data storage apparatus comprising means for storing and retrieving data in respective write and read operations, and first and second set of addressing electrodes are provided, the latter set having electrodes that preferably are oriented orthogonally to the electrodes of the first set, and the...http://www.google.de/patents/US6683803?utm_source=gb-gplus-sharePatent US6683803 - Apparatus and methods for data storage and retrieval
