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Yutaka Hirai, Toshiyuki Komatsu, Katsumi Nakagawa, Teruo Misumi, Tadaji Fukuda: Electrophotographic photosensitive member and process for production thereof. Canon Kabushiki Kaisha, Fitzpatrick Cella Harper & Scinto, May 5, 1981: US04265991 (159 worldwide citation)

A layer of amorphous silicon containing H, preferably 10-40 atomic %H, is used as a photoconductive layer for electrophotographic photosensitive member.


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Katsumi Nakagawa, Tatsundo Kawai, Yasuo Kuroda: LED array and partitive driving method therefor using overlapping activation periods. Canon Kabushiki Kaisha, Fitzpatrick Cella Harper & Scinto, November 5, 1991: US05063462 (134 worldwide citation)

An LED array has a plurality of LED blocks each of which can independently be illuminated or extinguished. The LED array includes an illumination control unit for illuminating, after the lapse of a time period T1 after a block is illuminated, a succeeding block; an extinguishment control unit for ex ...


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Katsumi Nakagawa, Toshiyuki Komatsu, Yoshiyuki Osada, Satoshi Omata, Yutaka Hirai, Takashi Nakagiri: Semiconductor device including a semiconductor layer having a polycrystalline silicon film with selected atomic constituency. Canon Kabushiki Kaisha, Fitzpatrick Cella Harper & Scinto, August 23, 1988: US04766477 (79 worldwide citation)

A semiconductor device mainly comprises a semiconductor layer of a polycrystalline silicon film containing at least one atom selected from the group consisting of carbon, sulfur, nitrogen and oxygen as a constituent.


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Katsumi Nakagawa, Takao Yonehara, Shoji Nishida, Kiyofumi Sakaguchi: Method of producing semiconductor member and method of producing solar cell. Canon Kabushiki Kaisha, Fitzpatrick Cella Harper & Scinto, February 20, 2001: US06190937 (73 worldwide citation)

To accomplish both higher performance of a crystal and lower cost in a semiconductor member, and to produce a solar cell having a high efficiency and a flexible shape at low cost, the semiconductor member is produced by the following steps, (a) forming a porous layer in the surface region of a subst ...


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Masaaki Iwane, Katsumi Nakagawa, Makoto Iwakami, Shoji Nishida, Noritaka Ukiyo, Yukiko Iwasaki, Masaki Mizutani: Separation method of semiconductor layer and production method of solar cell. Canon Kabushiki Kaisha, Fitzpatrick Cella Harper & Scinto, January 27, 2004: US06682990 (71 worldwide citation)

The separation method of a semiconductor layer according to the present invention comprises separating a semiconductor layer and a semiconductor substrate at a separation layer formed therebetween, wherein a face of the semiconductor layer at the side opposite to the separation layer and/or a face o ...


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Masafumi Sano, Katsumi Nakagawa, Hideo Hosono, Toshio Kamiya, Kenji Nomura: Field effect transistor. Canon Kabushiki Kaisha, Tokyo Institute of Technology, Fitzpatrick Cella Harper & Scinto, January 11, 2011: US07868326 (65 worldwide citation)

A novel field-effect transistor is provided which employs an amorphous oxide. In an embodiment of the present invention, the transistor comprises an amorphous oxide layer containing electron carrier at a concentration less than 1×10−18/cm3, and the gate-insulating layer is comprised of a first layer ...


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Katsumi Nakagawa, Takao Yonehara, Yasuyoshi Takai, Kiyofumi Sakaguchi, Noritaka Ukiyo, Masaaki Iwane, Yukiko Iwasaki: Method of producing thin-film single-crystal device, solar cell module and method of producing the same. Canon Kabushiki Kaisha, Fitzpatrick Cella Harper & Scinto, September 17, 2002: US06452091 (60 worldwide citation)

The peeling of a thin-film single-crystal from a substrate is carried out so that the directions of straight lines on the single-crystal surface made by planes on which the single-crystal is apt to cleave are different from the front line direction of the peeled single-crystal. This single-crystal i ...


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Katsumi Nakagawa, Takao Yonehara, Shoji Nishida, Kiyofumi Sakaguchi: Method of producing semiconductor member and method of producing solar cell. Canon Kabushiki Kaisha, Fitzpatrick Cella Harper & Scinto, June 29, 2004: US06756289 (60 worldwide citation)

To accomplish both of higher performance of a crystal and lower cost in a semiconductor member, and to produce a solar cell having a high efficiency and a flexible shape at low cost, the semiconductor member is produced by the following steps, (a) forming a porous layer in the surface region of a su ...


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Toshiyuki Komatsu, Yutaka Hirai, Katsumi Nakagawa, Tadaji Fukuda: Image-forming member for electrophotography comprising hydrogenated amorphous matrix of silicon and/or germanium. Canon Kabushiki Kaisha, Fitzpatrick Cella Harper & Scinto, September 11, 1984: US04471042 (58 worldwide citation)

An image-forming member for electrophotography has a photoconductive layer comprising a hydrogenated amorphous semiconductor composed of silicon and/or germanium as a matrix and at least one chemical modifier such as carbon, nitrogen and oxygen contained in the matrix.