1
Tamaki Kaneko, Seiichi Miyakawa, Toyokazu Satomi, Yutaka Koizumi, Isao Nakamura, Yasuhiro Tabata: Auto document feeder for use with duplex copying machine. Ricoh Company, McGlew and Tuttle, November 4, 1980: US04231561 (80 worldwide citation)

The auto document feeder is for use with duplex copying machines, and is capable of inverting duplex sheet originals, having images on both surfaces, automatically and feeding the originals to an exposure station automatically. The feeder comprises trays for stacking a plurality of sheet originals t ...


2
Seiichi Miyakawa, Susumu Tatsumi, Koji Sakamoto: Method of maintaining the correct conditions of an electrophotographically duplicated image. Ricoh Company, Oblon Fisher Spivak McClelland & Maier, August 5, 1980: US04215930 (51 worldwide citation)

A method of maintaining the correct conditions of an electrophotographically duplicated image, which uses a reference plate having at least a dark-tone area and a light-tone area and in which signals associated with the reference plate are detected and synthesized to control the duplicating process ...


3
Koji Sakamoto, Seiichi Miyakawa, Susumu Tatsumi: Electrostatic copying machine. Ricoh Company, Jordan and Hamburg, October 7, 1980: US04226525 (46 worldwide citation)

An exposure unit radiates a light image of an original document onto a charged photoconductive member to form an electrostatic image through localized photoconduction. A developing unit applies a powdered developing substance comprising carrier particles and toner particles to the photoconductive me ...


4
Teruyuki Ohnuma, Kaoru Shimizu, Seiichi Miyakawa, Hajime Oyama: Development apparatus. Ricoh Company, Cooper Dunham Clark Griffin & Moran, March 25, 1980: US04194830 (43 worldwide citation)

A development apparatus for developing a latent electrostatic image formed on a photoconductor with a one-component type developer has a charging device comprising at least two charging members for charging the developer held in a developer container. The first charging member serves both as a docto ...


5
Teruyuki Ohnuma, Seiichi Miyakawa, Nobuo Mochizuki, Hajime Oyama, Yukio Tabata: Development apparatus. Ricoh Company, Henry T Burke, May 10, 1983: US04382420 (32 worldwide citation)

An apparatus for developing a latent electrostatic image formed on a photoconductive recording material in a dry type electrophotographic copying machine typically employing a one-component type developer comprises a conductive electrode held in contact with the developer. The electrode is connected ...


6
Seiichi Miyakawa, Tadahiro Eda: Method and apparatus for electrically biasing developing electrode of electrophotographic device. Ricoh, Frank J Jordan, September 27, 1977: US04050806 (31 worldwide citation)

A photoconductive member is charged and radiated with a light image to produce an electrostatic image. Sensing electrodes automatically sense the remaining potential in a portion of the electrostatic image corresponding to a background area of the original document scanned to produce the light image ...


7
Koji Sakamoto, Seiichi Miyakawa, Susumu Tatsumi: Exposure control and other component control for electrostatic copying machine. Ricoh Company, Jordan and Hamburg, December 22, 1981: US04306804 (30 worldwide citation)

An exposure unit radiates a light image of an original document onto a charged photoconductive member to form an electrostatic image through localized photoconduction. A developing unit applies a powdered developing substance comprising carrier particles and toner particles to the photoconductive me ...


8
Teruyuki Ohnuma, Seiichi Miyakawa, Hajime Oyama: Apparatus for developing electrostatic image. Ricoh Company, Wyatt Gerber Shoup Scobey & Badie, September 1, 1981: US04286543 (29 worldwide citation)

A method of and apparatus for developing a latent electrostatic image in which a one-component type developer is deposited on the surface of a developer applicator having a conductive and elastic endless surface and the developer applicator is brought into pressure contact with a latent electrostati ...


9
Seiichi Miyakawa, Takashi Yano: Electrostatic copying machine comprising improved magnetic brush developing-cleaning unit. Ricoh Company, David G Alexander, February 27, 1979: US04142165 (28 worldwide citation)

A magnetic brush is used to develop a toner image on a photoconductive drum and subsequently to remove residual toner substance from the drum. An electrode roller is disposed closely adjacent to the magnetic brush between a developing tank containing the toner substance and the drum in the direction ...


10
Mie Yoshino, Makoto Obu, Takeo Tsukamoto, Seiichi Miyakawa, Yusuke Takeda, Masami Hiramatsu: Wet-type image forming apparatus for forming a condensed toner image. Ricoh Company, Oblon Spivak McClelland Maier & Neustadt P C, September 9, 1997: US05666616 (26 worldwide citation)

A wet-type image forming apparatus produces a high-quality toner image by condensing a toner image on a photosensitive drum and adhering the toner image onto the photosensitive drum without contacting a liquid carrier applied on the photosensitive drum. The photosensitive drum carries a latent image ...



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