The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 04, 2018
Filed:
Mar. 24, 2017
Canon Kabushiki Kaisha, Tokyo, JP;
Osamu Ariizumi, Matsudo, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A developing apparatus includes a rotatable developer bearing member, a first conveyance screw in a first chamber to convey the developer, and a second conveyance screw in a second chamber to convey the developer. The second conveyance screw includes a first screw portion facing a communication portion between the first and second chambers, a second screw portion downstream of the first screw portion, and a third screw portion downstream of the first screw portion and upstream of the second screw portion and facing the second communication portion. The first screw portion includes a first blade portion formed spirally around a rotation shaft of the second conveyance screw, the second screw portion has a second blade portion formed spirally around the rotation shaft of the second conveyance screw, and the third screw portion comprises no blade portion formed spirally around the rotation shaft of the second conveyance screw.