ALEXANDRIA, Va., March 3 -- United States Patent no. 12,566,389, issued on March 3, was assigned to CANON K.K. (Tokyo).
"Image forming apparatus" was invented by Kosuke Takeuchi (Chiba, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A carrier collecting device includes a rotatable sleeve and a magnet non-rotatably disposed inside the sleeve, and collects the carrier on the image bearing member. A first bias is applied to the sleeve during the image forming operation. A second bias is applied to the sleeve in a predetermined mode during non-image forming. When, a duration of a voltage of a reverse polarity to a charging polarity of the toner is t1, a duration of a voltage of a same polarity as the charg...