An Automatic Long-Life Infrared Emitter & Locator System which may be used to locate persons in need of assistance or marked objects is disclosed. Since the emitter (10) operates continuously and emanates infrared radiation (21) that can not be seen by the user, no affirmative action is required to activate...http://www.google.com/patents/US6069557?utm_source=gb-gplus-sharePatent US6069557 - Automatic long-life infrared emitter & locator system
