Electrostatographic photosensitive device comprising hole injecting and hole transport layers
Patent 4123269 Issued on October 31, 1978. Estimated Expiration Date: September 29, 1997. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
Disclosed is a layered photosensitive device for use in electrostatographic copying. The device comprises:(a) an electrically conductive substrate;(b) a layer of material capable of injecting holes into a layer on its surface;(c) a hole transport layer in operative contact with the layer of hole injecting material which transport layer comprises a combination of a highly insulating organic resin having dispersed therein small molecules of an electrically active material, the combination of which is substantially non-absorbing to visible light but allows injection of photogenerated holes fom a charge generator layer in contact with said hole transport layer and electrically induced holes from the layer of injecting material;(d) a layer of a charge generating photoconductive material on and in operative contact with the charge transport layer; and(e) a layer of an insulating organic resin overlaying the layer of charge generating material.