Ryouta Doi — 10 Patents at Hitachi

Ryouta Doi has been granted 10 US patents while listed as an inventor at Hitachi. The first was granted in 1985 and the most recent in August 2006. Ryouta Doi ranks #481,000 of 4,157,543 US inventors in our database (top 11.6%). Patent records list Ryouta Doi in Ibaraki, JP.

Patents per Year

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Showing 1–10 of 10 patents

Patent #	Title	Co-Inventors	Date	Approx Value ⓘ
7093432	Exhaust gas purification apparatus of internal combustion engine and catalyst for purifying exhaust gas of internal combustion engine	Hiroshi Hanaoka, Osamu Kuroda, Hidehiro Iizuka, Toshio Ogawa, Hisao Yamashita +6 more	2006-08-22
6823659	Moisture removal device and method thereof for internal combustion engine use exhaust gas cleaning device	Toshifumi Hiratsuka, Norihiro Shinotsuka, Osamu Kuroda, Yuichi Kitahara, Takeshi Inoue +1 more	2004-11-30	$210,000
6596247	Method for purifying exhaust gas from internal combustion engines	Hidehiro Iizuka, Hiroshi Hanaoka, Toshio Ogawa, Osamu Kuroda, Hisao Yamashita +3 more	2003-07-22	$178,000
6397582	Exhaust gas purification apparatus of internal combustion engine and catalyst for purifying exhaust gas of internal combustion engine	Hiroshi Hanaoka, Osamu Kuroda, Hidehiro Iizuka, Toshio Ogawa, Hisao Yamashita +6 more	2002-06-04	$159,000
6272848	Exhaust gas cleaning apparatus and method for internal combustion engine	Kojiro Okude, Hidehiro Iizuka, Osamu Kuroda, Toshio Ogawa, Hisao Yamashita +4 more	2001-08-14	$251,000
6161378	Exhaust gas purification apparatus of internal combustion engine and catalyst for purifying exhaust gas internal combustion engine	Hiroshi Hanaoka, Osamu Kuroda, Hidehiro Iizuka, Toshio Ogawa, Hisao Yamashita +6 more	2000-12-19	$730,000
5972828	Method of manufacturing catalyst for cleaning exhaust gas released from internal combustion engine, and catalyst for the same	Hidehiro Iizuka, Hiroshi Hanaoka, Toshio Ogawa, Osamu Kuroda, Hisao Yamashita +2 more	1999-10-26	$443,000
5968870	Catalyst for purifying exhaust gas from internal combustion engine and purifying method thereof	Hidehiro Iizuka, Hiroshi Hanaoka, Toshio Ogawa, Osamu Kuroda, Hisao Yamashita +3 more	1999-10-19	$385,000
4612261	Fuel cell battery using acidic electrolyte	Tsutomu Tsukui, Toshio Shimizu	1986-09-16	$112,000
4562123	Liquid fuel cell	Toshio Shimizu, Takanori Satou, Tsutomu Tsukui, Motoo Yamaguchi	1985-12-31	$29,000

Ryouta Doi — 10 Patents

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