A delay unit (10) comprises a timing strip (14) and, optionally, a calibration strip (20) deposited on a substrate (12). The timing and calibration strips comprise energetic materials which optionally may comprise particles of nanosize materials, e.g., a fuel and an oxidizer, optionally applied as separate...http://www.google.es/patents/US7650840?utm_source=gb-gplus-sharePatente US7650840 - Delay units and methods of making the same
