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:
Nov. 10, 2015
Filed:
Oct. 30, 2013
Junichi Matsumoto, Kanagawa, JP;
Kiyonori Tsuda, Kanagawa, JP;
Nobuo Takami, Kanagawa, JP;
Yutaka Takahashi, Kanagawa, KR;
Kentaro Mikuniya, Tokyo, JP;
Junichi Matsumoto, Kanagawa, JP;
Kiyonori Tsuda, Kanagawa, JP;
Nobuo Takami, Kanagawa, JP;
Yutaka Takahashi, Kanagawa, KR;
Kentaro Mikuniya, Tokyo, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A developer conveyance device includes a developer reservoir for containing developer, and a positive-displacement pump to alternately generate positive pressure and negative pressure by varying a volume of space therein to transport developer from the developer reservoir to a destination. When Qp represents a volume of developer moved by a single pumping action of the pump, calculated by multiplying a maximum flow amount of the pump per unit time by an operation time of the pump; Qd represents a volume of developer contained in the developer reservoir; and Qe represents a volume of developer present in a virtual columnar space defined by vertically raising the developer outlet to a level of developer contained in the developer reservoir, either Qp>Qd or Qp>Qe is satisfied.