Abstract: A method for recycling photoconductors is disclosed. In this method, the charge transport layer is selectively removed from the photoconductor without adversely affecting the electrical properties of the charge generating layer. The recycled drum may then be recoated with a new charge transport layer and reused in an electrophotographic process. In this method, the photoconductor to be recycled is placed in a specifically selected solvent, such as a dibasic ester, and is subjected to ultrasonic energy, preferably for a period not to exceed about 15 minutes.

Abstract: A method for recycling photoconductors is disclosed. In this method, the charge transport layer is selectively removed from the photoconductor without adversely affecting the electrical properties of the charge generating layer. The recycled drum may then be recoated with a new charge transport layer and reused in an electrophotographic process. In this method, the photoconductor to be recycled is placed in a specifically selected solvent, such as a dibasic ester, and is subjected to ultrasonic energy, preferably for a period not to exceed about 15 minutes.

Abstract: A security system for monitoring comprising an optical source for producing optical signals. The security system is also comprised of a detector in optical communication with the optical source which receives the optical signals produced by the optical source. The security system additionally is comprised of an electrical circuit in communication with the optical source and the detector, which is either in a first state or a second state. The circuit controls the optical source and determines whether the optical signal received by the detector is such that the circuit is in the first state or the second state. The circuit also indicates when the optical signal received by the detector is such that a transition from the first state to the second state is imminent to occur. The presence of this imminent transition is otherwise called the pre-alarm condition.