Electrographic development process
Patent 4121931 Issued on October 24, 1978. Estimated Expiration Date: 
June 30, 1996. 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.
June 30, 1996. 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.Patent References 3645770 3900001 3909258 InventorApplicationNo. 05/701113 filed on 06/30/1976US Classes:430/120, Dry powder developing399/267Magnetic brushExaminersPrimary: Martin, Roland E. Jr.Attorney, Agent or FirmInternational ClassG03G 15/09 (20060101)AbstractA method using a one-component developer of magnetically attractable, electrically insulating toner particles for developing an electrical potential pattern at a surface. Electrical means and an electrode-developer transport means are provided with the electrode-developer transport means positioned relative to the electrical potential pattern for establishing a unidirectional electrical difference between the potential pattern and an electrically conductive portion provided by the electrode-developer transport means. Rapid turbulent physical mixing action of the toner is provided for producing sufficient repetitive electrical contact of the toner with the electrically conductive portion to cause electrical charge of a predetermined polarity to be injected onto the toner particles. A charge level is so produced, which is sufficient to cause such charged toner particles to be deposited on the potential pattern bearing surface in accordance with the potential pattern.Other References
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