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USPTO Patent Rankings Data through Dec 31, 2025
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Kiyoshi Narato — 20 Patents

Hitachi: 20 patents #1,757 of 28,497Top 7%
BABabcock-Hitachi: 7 patents #27 of 415Top 7%
BKBabcock-Hitachi K.K.: 1 patents #20 of 70Top 30%
Ibaraki, JP: #399 of 6,779 inventorsTop 6%
Overall (All Time): #214,803 of 4,157,543Top 6%
20 Patents All Time
Kiyoshi Narato has been granted 20 US patents while listed as an inventor at Hitachi. The first was granted in 1981 and the most recent in September 1998. Kiyoshi Narato ranks #214,803 of 4,157,543 US inventors in our database (top 5.2%). Patent records list Kiyoshi Narato in Ibaraki, JP.

Patents per Year

Patents granted per year, 1981 to 1998Bar chart with a peak of 3 patents in 1991.peak 31981: 1 patents19811982: 1 patents1983: 1 patents19831984: 1 patents1985: 1 patents19851987: 1 patents1988: 2 patents19881989: 1 patents1990: 2 patents19901991: 3 patents1993: 1 patents19931994: 3 patents1997: 1 patents19971998: 1 patents1998

Issued Patents All Time

Showing 1–20 of 20 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
5806443 Pulverized coal burner and method of using same Hironobu Kobayashi, Masayuki Taniguchi, Tsuyoshi Kouno, Hirofumi Okazaki, Shigeki Morita +1 more 1998-09-15 $102,000
5685242 Pulverized coal combustion burner Hironobu Kobayashi, Masayuki Taniguchi, Tsuyoshi Kohno, Hirofumi Okazaki, Kazuyuki Ito +2 more 1997-11-11 $114,000
5349812 Gas turbine combustor and gas turbine generating apparatus Masayuki Taniguchi, Hironobu Kobayashi, Tadayoshi Murakami, Shigeru Azuhata, Michio Kuroda +1 more 1994-09-27 $74,000
5339635 Gas turbine combustor of the completely premixed combustion type Yasuo Iwai, Shigeru Azuhata, Kenichi Sohma, Hironobu Kobayashi, Tooru Inada +4 more 1994-08-23 $158,000
5328355 Combustor and combustion apparatus Hironobu Kobayashi, Shigeru Azuhata, Masayuki Taniguchi, Tadayoshi Murakami, Michio Kuroda +1 more 1994-07-12 $111,000
5231937 Pulverized coal burner, pulverized coal boiler and method of burning pulverized coal Hironobu Kobayashi, Shigeru Azuhata, Hiroshi Miyadera, Shigeki Morita, Tadashi Jimbo +2 more 1993-08-03 $77,000
5067419 Low NOx boiler Hironobu Kobayashi, Shigeru Azuhata, Kenichi Sohma, Yasuo Yoshii, Norio Arashi +10 more 1991-11-26 $45,000
5038558 Gas turbine combustor and a method of combustion thereby Kenichi Sohma, Shigeru Azuhata, Yasuo Iwai, Tooru Inada, Hironobu Kobayashi +5 more 1991-08-13 $82,000
5022849 Low NOx burning method and low NOx burner apparatus Yasuo Yoshii, Shigeru Azuhata, Norio Arashi, Kenichi Sohma, Tooru Inada +7 more 1991-06-11 $50,000
4973159 Spectroscope apparatus and reaction apparatus using the same Kenichi Sohma, Shigeru Azuhata, Tooru Inada, Hironobu Kobayashi, Norio Arashi +1 more 1990-11-27 $75,000
4907962 Low NOx burner Shigeru Azuhata, Hironobu Kobayashi, Kenichi Sohma, Tooru Inada, Norio Arashi +2 more 1990-03-13 $44,000
4820046 Spectroscope apparatus and reaction apparatus using the same Kenichi Sohma, Shigeru Azuhata, Tooru Inada, Hironobu Kobayashi, Norio Arashi +1 more 1989-04-11 $33,000
4784043 Atomizer and coal-water slurry fired boiler utilizing the same Hironobu Kobayashi, Shigeru Azuhata, Tooru Inada, Kenichi Sohma, Norio Arashi +2 more 1988-11-15 $172,000
4741279 Method of and apparatus for combusting coal-water mixture Shigeru Azuhata, Kazutoshi Higashiyama, Hironobu Kobayashi, Norio Arashi, Tooru Inada +7 more 1988-05-03 $119,000
4653998 Furnace system Ken-ichi Sohma, Norio Arashi, Shigeru Azuhata, Tooru Inada, Hironobu Kobayashi +2 more 1987-03-31 $74,000
4515094 Fuel jet method and apparatus for pulverized coal burner Shigeru Azuhata, Norio Arashi, Tooru Inada, Kenichi Souma, Keizou Ohtsuka +2 more 1985-05-07 $40,000
4436699 Monitoring system for checking electric rotary machine for local overheating Keizou Ohtsuka, Tooru Inada, Takashi Watanabe 1984-03-13 $46,000
4373376 Method and apparatus for diagnosing overheating of an electric machine Keizo Ohtsuka, Sadahiko Niwa 1983-02-15 $100,000
4364032 Method and apparatus for diagnosing local overheating in a rotary electric machine Keizou Ohtsuka, Sadahiko Niwa 1982-12-14 $61,000
4268482 Catalytic reactor Norio Arashi, Tadayoshi Murakami, Masaaki Shiga, Tomihisa Ishikawa 1981-05-19 $189,000