1
Junichi Matsumoto, Nobuo Kasahara, Nobuo Iwata, Satoshi Muramatsu, Tomoyuki Ichikawa, Yoshio Hattori, Tomotoshi Nakahara, Takaaki Yanagisawa, Masumi Sato, Kouta Fujimori, Kazuhisa Sudo: Toner supply unit and image forming apparatus. Ricoh Company, Oblon Spivak McClelland Maier & Neustadt P C, September 30, 2003: US06628908 (88 worldwide citation)

The toner supply unit is provided with a preventing unit for preventing toner contamination due to toner leakage from that sealing valve. A mouth ring of the toner container is provided with the sealing valve. This valve is opened/closed by removing/inserting a nozzle.


2
Junichi Matsumoto, Nobuo Kasahara, Satoshi Muramatsu, Nobuo Iwata, Takaaki Yanagisawa, Tomotoshi Nakahara, Masumi Sato, Yoshio Hattori, Kouta Fujimori, Kazuhisa Sudo: Nozzle having an end portion capable of penetrating into a toner discharging portion included in a toner container that stores powdery toner. Ricoh Company, Oblon Spivak McClelland Maier & Neustadt P C, May 21, 2002: US06393241 (83 worldwide citation)

A toner conveying device for an image forming apparatus includes a nozzle capable of penetrating into a toner container when the toner container is mounted to the image forming apparatus. The nozzle has a tubular structure forming an air passage for sending air into the toner container and a toner p ...


3
Nobuo Kasahara, Kouji Yamanobe: Electrophotographic apparatus comprising density sensor means. Ricoh Company, David G Alexander, July 7, 1981: US04277162 (72 worldwide citation)

One or more marks (34), (36) are provided on a non-image area of a platen (23) which supports an original document (16). Electrostatic images of the document (16) and mark (34) are formed on a photoconductive drum (12) and developed to form toner images. The toner image of the original document (16) ...


4
Koji Suzuki, Hiroshi Saitoh, Hiroshi Ishii, Ichirou Komuro, Toshihiro Sugiyama, Takashi Hodoshima, Nobuo Kasahara, Satoshi Muramatsu: Image forming apparatus having recycling of residual toner. Ricoh Company, Oblon Spivak McClelland Maier & Neustadt P C, August 29, 2000: US06112046 (64 worldwide citation)

An image forming apparatus capable of collecting toner left on an image carrier after image transfer during an electrophotographic process, and returning the toner to a developing unit for reuse in the form of an air-toner mixture is disclosed. A toner conveying device includes a screw pump and a ho ...


5
Satoshi Muramatsu, Junichi Matsumoto, Nobuo Kasahara, Nobuo Iwata: Developer container for an image forming apparatus. Ricoh Company, Oblon Spivak McClelland Maier & Neustadt P C, September 30, 2003: US06628915 (63 worldwide citation)

A developer container storing a developer of the present invention includes a developer outlet formed in the side wall thereof, and a shutter member for selectively opening or closing the developer outlet. The shutter member opens the developer outlet when the developer container is mounted to the b ...


6
Satoshi Muramatsu, Takashi Hodoshima, Nobuo Kasahara: Screw pump, toner conveying device using the same and toner filling system. Ricoh Company, Oblon Spivak McClelland Maier & Neustadt P C, September 14, 1999: US05953567 (59 worldwide citation)

A screw pump for use in an image forming apparatus for conveying toner has a female screw type stator formed with a double pitch spiral groove in its inner periphery, and a male screw type rotor rotatably received in the stator. Assuming that the rotor has a sectional diameter of RA, and that the st ...


7
Satoshi Muramatsu, Nobuo Kasahara, Takashi Hodoshima: Image forming apparatus including a toner recycling mechanism. Ricoh Company, Oblon Spivak McClelland Maier & Neustadt P C, November 16, 1999: US05987298 (57 worldwide citation)

In an electrophotographic image forming apparatus including a toner recycling mechanism, a collected toner conveying device is free from troubles particular to a conventional device using a screw pump and an air pump and conveying toner and air mixture via an elastic tubing, i.e., the wear of a stat ...


8
Nobuo Kasahara, Satoshi Muramatsu: Developer container for an image forming apparatus and method of conveying a developer. Ricoh Company, Oblon Spivak McClelland Maier & Neustadt P C, March 13, 2001: US06201941 (57 worldwide citation)

A developer replenishing device included in an image forming apparatus for replenishing a developer to a developing unit is disclosed and includes a developer container filled with the developer. An air pump feeds compressed air into the developer container to thereby fluidize the developer. A powde ...


9
Goro Katsuyama, Nobuo Iwata, Nobuo Kasahara, Satoshi Muramatsu, Junichi Matsumoto: Image forming device, powder feeding device, toner storage container, powder storage container, and method of recycling the containers. Ricoh Company, Oblon Spivak McClelland Maier & Neustadt P C, October 2, 2007: US07277664 (56 worldwide citation)

A part of a toner supply path is formed in a setting unit, and a nozzle coupled to a toner container is provided, wherein the fitting direction of the toner container to the setting unit and the coupling direction of the nozzle to the toner container are different.


10
Satoshi Muramatsu, Nobuo Iwata, Nobuo Kasahara, Junichi Matsumoto, Tomoyuki Ichikawa: Powder pump capable of effectively conveying powder and image forming apparatus using powder pump. Ricoh Company, Oblon Spivak McClelland Maier & Neustadt P C, July 22, 2003: US06597883 (56 worldwide citation)

A powder pump includes a stator having a through hole that includes two spirally extended grooves, and a rotor, which is rotatably provided to the through hole of the stator and is spirally extended such that a cavity to convey a powder is formed between an outer peripheral surface of the rotor and ...