A programmable device to which information can be electrically written to, and can store the information, even after power is cut off is disclosed. The programmable device has a lower electrode, an insulating layer formed on the lower electrode, and an upper electrode formed on the insulating layer....http://www.google.de/patents/US5246873?utm_source=gb-gplus-sharePatent US5246873 - Method of fabricating a programmable device including a protective region
