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Assignee profile:

IDEMITSU KOSAN CO.,LTD.

City:

Tokyo

Country:

Japan

Published Applications:

381

Last publication date:

2026-06-04

Patent Grants:

125

Last grant date:

2026-03-10

Quarterly IDEMITSU KOSAN CO.,LTD. Patent Applications

Top Inventors for applications by IDEMITSU KOSAN CO.,LTD.

These are the the leading inventors for applications assigned to IDEMITSU KOSAN CO.,LTD.:

Satomi TASAKI 37 Tokyo, Japan
Yuki Nakano 33 Sodegaura-shi, Japan
Kazuki Nishimura 32 Tokyo, Japan
Yuki Nakano 23 Sodegaura, Japan

Satomi TASAKI 20 Sodegaura-shi, Japan
Yuki Nakano 19 Tokyo, Japan
Masato NAKAMURA 18 Tokyo, Japan
Taro YAMAKI 18 Sodegaura-shi, Japan

Kazuki Nishimura 17 Sodegaura-shi, Japan
Hiroaki Toyoshima 17 Tokyo, Japan
Hiroaki ITOI 16 Tokyo, Japan
Tetsuya Masuda 16 Tokyo, Japan

Ryota TAKAHASHI 15 Sodegaura-shi, Japan
Satomi Tasaki 15 Sodegaura, Japan
Hiroaki ITOI 15 Sodegaura-shi, Japan
Tetsuya MASUDA 14 Sodegaura-shi, Japan

Sayaka MIZUTANI 12 Tokyo, Japan
Emiko Kambe 12 Tokyo, Japan
Tasuku HAKETA 12 Sodegaura-shi, Japan
Ryota Takahashi 11 Sodegaura, Japan

Taro Yamaki 11 Sodegaura, Japan
Ryota TAKAHASHI 11 Tokyo, Japan
Kazuki Nishimura 11 Sodegaura, Japan
Hiroaki Itoi 10 Sodegaura, Japan

Masato MITANI 9 Tokyo, Japan
Yuichiro KAWAMURA 9 Tokyo, Japan
Tetsuya Masuda 9 Sodegaura, Japan
Yusuke Takahashi 9 Tokyo, Japan

Kei YOSHIDA 8 Tokyo, Japan
Keita SEDA 8 Sodegaura-shi, Japan
Masato NAKAMURA 8 Sodegaura-shi, Japan
Tomoki KATO 7 Sodegaura-shi, Japan

Yasuhiro ISHIKAWA 7 Ichihara-shi, Chiba, Japan
Masatoshi Saito 7 Tokyo, Japan
Shintaro BAN 7 Tokyo, Japan
Masato Nakamura 7 Sodegaura, Japan

Tsukasa SAWATO 7 Chiyoda-ku, Japan
Tasuku Haketa 7 Sodegaura, Japan
Shota TANAKA 7 Chiyoda-ku, Japan
Kei YOSHIDA 7 Sodegaura-shi, Japan

Yu Kudo 7 Tokyo, Japan
Ryoji Maeda 7 Sodegaura-shi, Japan
Kyohei HORIGUCHI 7 Tokyo, Japan
Masatoshi Saito 7 Sodegaura-shi, Japan

Yusuke TAKAHASHI 6 Chiyoda-ku, Japan
Yusuke Takahashi 6 Sodegaura-shi, Japan
Hidetsugu Ikeda 6 Sodegaura-shi, Japan
Yoshinao SHIRASAKI 6 Tokyo, Japan

Taro YAMAKI 6 Tokyo, Japan
Minoru YABUKAMI 6 Ichihara-shi, Chiba, Japan
Takushi Shiomi 6 Sodegaura-shi, Japan
Takuto FUKAMI 6 Chiyoda-ku, Japan

Yuichiro Kawamura 6 Sodegaura-shi, Japan
Minoru Senga 5 Sodegaura-shi, Japan
Kazushige MATSUBARA 5 Tokyo, Japan
Koichi SUGA 5 Tokyo, Japan

Toshinari OGIWARA 5 Sodegaura-shi, Japan
Takayoshi KAMBARA 5 Chiba-shi, Chiba, Japan
Yoshinori AOYAMA 5 Tokyo, Japan
Futoshi UTSUNO 5 Sodegaura-shi, Japan

Hisato Matsumoto 5 Tokyo, Japan
Yu KUDO 5 Sodegaura-shi, Japan
Shingo ONODERA 5 Chiba, Japan
Toshio ISOZAKI 5 Chiba-shi, Chiba, Japan

Hiroaki YAMADA 5 Chiba-shi, Chiba, Japan
Minoru SENGA 5 Tokyo, Japan
Tasuku HAKETA 5 Sodegaura-shi, Chiba, Japan
Kota Terai 5 Sodegaura-shi, Japan

Mikio HAMANO 5 Tokyo, Japan
Toru BANDO 5 Chiba, Japan
Yasuhiro Ishikawa 5 Ichihara, Japan
Keita Seda 5 Sodegaura, Japan

Tasuku HAKETA 5 Tokyo, Japan
Tomoki Kato 5 Sodegaura, Japan
Masaru Nakagawa 5 Sodegaura-shi, Japan
Yuki Nakano 5 Sodegaura-shi Chiba, Japan

Hirokatsu Ito 4 Sodegaura-shi, Japan
Katsuki ITO 4 Tokyo, Japan
Tsukasa SAWATO 4 Chiba-shi, Japan
Keitaro YAMADA 4 Tokyo, Japan

Yoshihide MIYAGAWA 4 Tokyo, Japan
Yusuke ISEKI 4 Chiba-shi, Chiba, Japan
Yongguk LEE 4 Sodegaura-shi, Japan
Kazushige IDETA 4 Chiba-shi, Chiba, Japan

Shota TANAKA 4 Chiyoda-ku, Tokyo, Japan
Ryoji Maeda 4 Sodegaura, Japan
Kota Terai 4 Sodegaura, Japan
Takeshi Ikeda 4 Tokyo, Japan

Nobuhiro WATANABE 4 Chiba-shi, Chiba, Japan
Tasuku HAKETA 4 Chiba-shi, Japan
Shota TANAKA 4 Chiba-shi, Japan
Toshinari Ogiwara 4 Sodegaura, Japan

Hirokatsu ITO 4 Ichihara-shi, Japan
Yutaka OBATA 4 Tokyo, Japan
Sigma HASHIMOTO 4 Tokyo, Japan
Yusuke TAKAHASHI 4 Chiba-shi, Japan

Yusuke Iseki 4 Chiba, Japan
Takayasu SADO 4 Tokyo, Japan
Takuto FUKAMI 4 Chiba-shi, Japan
Hiroaki ITOI 4 Chiyoda-ku, Tokyo, Japan

Recent patent applications by IDEMITSU KOSAN CO.,LTD.

IDEMITSU KOSAN CO.,LTD. based in Tokyo, JP has been assigned the rights to these inventions. The list includes both Pending Applications and Patent Grants:

#1 | 2026-06-04

US20260157020A1

Electricity

ORGANIC ELECTROLUMINESCENT ELEMENT AND ELECTRONIC DEVICE

#2 | 2026-05-14

US20260132045A1

Chemistry; metallurgy

CHALCOGENIDE PEROVSKITE

#3 | 2026-05-07

US20260128363A1

Electricity

SULFIDE SOLID ELECTROLYTE MANUFACTURING METHOD

#4 | 2026-03-19

US20260082807A1

Electricity

ORGANIC ELECTROLUMINESCENCE DEVICE AND ELECTRONIC APPARATUS

#5 | 2026-03-05

US20260062639A1

Chemistry; metallurgy

LUBRICATING OIL COMPOSITION

#6 | 2026-02-26

US20260059934A1

Electricity

ORGANIC ELECTROLUMINESCENCE ELEMENT, ORGANIC ELECTROLUMINESCENCE DEVICE, ELECTRONIC APPARATUS, EMITTER, SOLAR CELL, AND LIGHT SENSOR

#7 | 2026-02-26

US20260058192A1

Electricity

GLASS SOLID ELECTROLYTE AND LITHIUM ION BATTERY

#8 | 2026-02-19

US20260051534A1

Electricity

GLASS-CERAMICS SOLID ELECTROLYTE AND LITHIUM-ION BATTERY

#9 | 2026-02-12

US20260042751A1

Chemistry; metallurgy

AROMATIC HETEROCYCLIC DERIVATIVE, MATERIAL FOR ORGANIC ELECTROLUMINESCENT ELEMENT, AND ORGANIC ELECTROLUMINESCENT ELEMENT

#10 | 2026-01-22

US20260022305A1

Chemistry; metallurgy

LUBRICATING OIL COMPOSITION

#11 | 2026-01-08

US20260013394A1

Electricity

COMPOUND, MATERIAL FOR ORGANIC ELECTROLUMINESCENCE DEVICE, ORGANIC ELECTROLUMINESCENCE DEVICE, AND ELECTRONIC APPARATUS

#12 | 2026-01-08

US20260008975A1

Chemistry; metallurgy

LUBRICANT COMPOSITION

#13 | 2026-01-08

US20260008745A1

Chemistry; metallurgy

COMPOUND, MATERIAL FOR ORGANIC ELECTROLUMINESCENT ELEMENTS, ORGANIC ELECTROLUMINESCENT ELEMENT AND ELECTRONIC DEVICE

#14 | 2026-01-08

US20260008676A1

Chemistry; metallurgy

METHOD FOR MANUFACTURING SULFIDE SOLID ELECTROLYTE

#15 | 2026-01-01

US20260001764A1

Chemistry; metallurgy

METHOD FOR PRODUCING SULFIDE SOLID ELECTROLYTE

#16 | 2025-12-25

US20250388468A1

Chemistry; metallurgy

METHOD FOR PRODUCING SULFIDE SOLID ELECTROLYTE

#17 | 2025-12-04

US20250374825A1

Electricity

COMPOUND, ORGANIC ELECTROLUMINESCENT ELEMENT MATERIAL, ORGANIC ELECTROLUMINESCENT ELEMENT, AND ELECTRONIC DEVICE

#18 | 2025-12-04

US20250374749A1

Electricity

ORGANIC ELECTROLUMINESCENT ELEMENT AND ELECTRONIC DEVICE

#19 | 2025-12-04

US20250374609A1

Electricity

LAMINATE STRUCTURE AND THIN FILM TRANSISTOR

#20 | 2025-12-04

US20250372697A1

Electricity

METHOD FOR PRODUCING SOLID ELECTROLYTE, AND ELECTROLYTE PRECURSOR

#21 | 2025-12-04

US20250368777A1

Chemistry; metallurgy

POLYCARBONATE-POLYORGANOSILOXANE COPOLYMER

#22 | 2025-11-27

US20250364592A1

Electricity

SOLID ELECTROLYTE AND METHOD FOR PRODUCING SAME

#23 | 2025-11-20

US20250359477A1

Electricity

ORGANIC ELECTROLUMINESCENT ELEMENT, COMPOUND, AND ELECTRONIC DEVICE

#24 | 2025-11-20

US20250354010A1

Chemistry; metallurgy

MOLDED BODY INCLUDING POLYCARBONATE-BASED RESIN COMPOSITION

#25 | 2025-11-13

US20250351458A1

Electricity

LAMINATE STRUCTURE AND THIN FILM TRANSISTOR

#26 | 2025-11-13

US20250349883A1

Electricity

MODIFIED SULFIDE SOLID ELECTROLYTE AND PRODUCTION METHOD THEREFOR, AND ELECTRODE COMPOSITE MATERIAL AND LITHIUM ION BATTERY

#27 | 2025-10-30

US20250338563A1

Electricity

LAMINATE STRUCTURE AND THIN FILM TRANSISTOR

#28 | 2025-10-30

US20250333380A1

Chemistry; metallurgy

AROMATIC AMINE DERIVATIVES AND ORGANIC ELECTROLUMINESCENT ELEMENTS USING SAME

#29 | 2025-10-23

US20250326692A1

Chemistry; metallurgy

OXIDE SINTERED BODY

#30 | 2025-10-16

US20250324847A1

Electricity

COMPOUND, MATERIAL FOR ORGANIC ELECTROLUMINESCENT ELEMENTS, ORGANIC ELECTROLUMINESCENT ELEMENT, AND ELECTRONIC DEVICE

#31 | 2025-10-09

US20250316750A1

Electricity

MODIFIED SULFIDE SOLID ELECTROLYTE, PRODUCTION METHOD FOR SAME, ELECTRODE MIXTURE, AND LITHIUM-ION BATTERY

#32 | 2025-10-09

US20250313774A1

Chemistry; metallurgy

LUBRICATING OIL COMPOSITION

#33 | 2025-10-02

US20250309557A1

Electricity

RADIO WAVE ABSORBER, RADIO WAVE ABSORPTION STRUCTURE INCLUDING RADIO WAVE ABSORBER, AND COMPOSITION FOR RADIO WAVE ABSORBER

#34 | 2025-10-02

US20250304872A1

Chemistry; metallurgy

LUBRICATING OIL COMPOSITION, METHOD FOR USING SAME, AND METHOD FOR PRODUCING SAME

#35 | 2025-09-18 ✅ Patent 12,570,920 granted on 2026-03-10

US20250290005A1

Chemistry; metallurgy

LUBRICATING OIL COMPOSITION, LUBRICATION METHOD, AND TRANSMISSION

#36 | 2025-09-11

US20250287774A1

Electricity

ORGANIC ELECTROLUMINESCENT ELEMENT, ORGANIC ELECTROLUMINESCENT DISPLAY APPARATUS, AND ELECTRONIC DEVICE

#37 | 2025-09-11

US20250282957A1

Chemistry; metallurgy

METHOD FOR PRODUCING CONDUCTIVE POLYMER-CONTAINING POROUS BODY

#38 | 2025-08-14

US20250261507A1

Electricity

ORGANIC ELECTROLUMINESCENCE DEVICE, AND ELECTRONIC DEVICE

#39 | 2025-08-07

US20250255087A1

Electricity

COMPOUND, ORGANIC ELECTROLUMINESCENT ELEMENT AND ELECTRONIC DEVICE

#40 | 2025-08-07

US20250253333A1

Electricity

MODIFIED SULFIDE SOLID ELECTROLYTE AND PRODUCTION METHOD FOR SAME, AND ELECTRODE COMBINED MATERIAL AND LITHIUM-ION BATTERY

#41 | 2025-08-07

US20250250482A1

Chemistry; metallurgy

COMPOUND, MATERIAL FOR ORGANIC ELECTROLUMINESCENT ELEMENTS, ORGANIC ELECTROLUMINESCENT ELEMENT, AND ELECTRONIC DEVICE

#42 | 2025-07-31

US20250248304A1

Electricity

COMPOUND, MATERIAL FOR ORGANIC ELECTROLUMINESCENT ELEMENTS, ORGANIC ELECTROLUMINESCENT ELEMENT, AND ELECTRONIC DEVICE

#43 | 2025-07-31

US20250248302A1

Electricity

ORGANIC ELECTROLUMINESCENT ELEMENT AND ELECTRONIC DEVICE

#44 | 2025-07-24

US20250241121A1

Electricity

ORGANIC ELECTROLUMINESCENT ELEMENT AND ELECTRONIC DEVICE

#45 | 2025-07-24

US20250241093A1

Electricity

REFLECTIVE ELECTRODE FOR AN EMITTING DEVICE

#46 | 2025-07-24

US20250236808A1

Chemistry; metallurgy

WATER-SOLUBLE LUBRICANT

#47 | 2025-07-17

US20250234771A1

Electricity

COMPOUND, MATERIAL FOR ORGANIC ELECTROLUMINESCENCE ELEMENT, ORGANIC ELECTROLUMINESCENCE ELEMENT, AND ELECTRONIC DEVICE

#48 | 2025-07-17

US20250233201A1

Electricity

SULFIDE SOLID ELECTROLYTE GLASS CERAMIC AND MANUFACTURING METHOD FOR SAME

#49 | 2025-07-17

US20250230278A1

Chemistry; metallurgy

AROMATIC POLYETHER, METHOD FOR PRODUCING AROMATIC POLYETHER, COMPOSITION AND SHEET

#50 | 2025-07-10

US20250223508A1

Chemistry; metallurgy

COMPOSITION, LUBRICATING OIL COMPOSITION AND GREASE COMPOSITION

#51 | 2025-07-03

US20250221302A1

Electricity

COMPOUND, MATERIAL FOR ORGANIC ELECTROLUMINESCENT ELEMENTS, ORGANIC ELECTROLUMINESCENT ELEMENT, AND ELECTRONIC DEVICE

#52 | 2025-07-03

US20250220975A1

Electricity

SEMICONDUCTOR FILM, AND METHOD FOR PRODUCING SEMICONDUCTOR FILM

#53 | 2025-07-03

US20250215344A1

Chemistry; metallurgy

LUBRICANT

#54 | 2025-06-26 ✅ Patent 12,618,019 granted on 2026-05-05

US20250207056A1

Chemistry; metallurgy

LUBRICATING OIL COMPOSITION FOR TWO-WHEELED VEHICLE

#55 | 2025-06-26

US20250207055A1

Chemistry; metallurgy

GREASE COMPOSITION

#56 | 2025-06-26

US20250207053A1

Chemistry; metallurgy

LUBRICANT COMPOSITION

#57 | 2025-06-26

US20250207050A1

Chemistry; metallurgy

COMPOUND, LUBRICATING OIL BASE OIL, AND LUBRICATING OIL COMPOSITION

#58 | 2025-06-19

US20250201909A1

Electricity

METHOD FOR MANUFACTURING SULFIDE SOLID ELECTROLYTE

#59 | 2025-06-19

US20250197760A1

Chemistry; metallurgy

LUBRICATING OIL COMPOSITION, FLASH POINT IMPROVER, AND FLASH POINT IMPROVING METHOD

#60 | 2025-06-19

US20250197754A1

Chemistry; metallurgy

LUBRICANT COMPOSITION AND METHOD FOR PRODUCING SAME

#61 | 2025-06-19

US20250197753A1

Chemistry; metallurgy

SOLID LUBRICANT MATERIAL, SLIDING MEMBER AND METHOD FOR FORMING SOLID LUBRICANT MATERIAL

#62 | 2025-06-12

US20250194415A1

Electricity

COMPOSITION, ORGANIC ELECTROLUMINESCENT ELEMENT, AND ELECTRONIC DEVICE

#63 | 2025-06-12 ✅ Patent 12,618,141 granted on 2026-05-05

US20250188591A1

Chemistry; metallurgy

SINTERED BODY, SPUTTERING TARGET, OXIDE THIN FILM, THIN FILM TRANSISTOR, ELECTRONIC EQUIPMENT, AND METHOD FOR PRODUCING SINTERED BODY

#64 | 2025-06-12

US20250188230A1

Chemistry; metallurgy

AROMATIC POLYETHER, COMPOSITION, FILM, POWDER, PELLETS, COMPOSITE MATERIAL PRODUCTION METHOD, AND COMPOSITE MATERIAL

#65 | 2025-06-12

US20250188219A1

Chemistry; metallurgy

AROMATIC POLYETHER, COMPOSITION, FILM, POWDER, PELLETS, COMPOSITE MATERIAL PRODUCTION METHOD, AND COMPOSITE MATERIAL

#66 | 2025-06-05

US20250183359A1

Electricity

CRYSTALLINE SULFIDE SOLID ELECTROLYTE AND METHOD FOR PRODUCING SAME

#67 | 2025-06-05

US20250179386A1

Chemistry; metallurgy

REFRIGERATOR OIL COMPOSITION AND MIXED COMPOSITION FOR REFRIGERATOR

#68 | 2025-05-29

US20250171632A1

Chemistry; metallurgy

COMPOSITION

#69 | 2025-05-29

US20250171315A1

Chemistry; metallurgy

COMPOSITION FOR PRODUCING ACTIVATED CARBON, METHOD FOR PRODUCING SAME, MOLDED BODY FOR PRODUCING ACTIVATED CARBON, METHOD FOR PRODUCING SAME, FIBERS FOR PRODUCING ACTIVATED CARBON FIBERS, METHOD FOR PRODUCING SAME, ACTIVATED CARBON PRECURSOR, ACTIVATED CARBON FIBER PRECURSOR, CARBIDE, CARBON FIBERS, ACTIVATED CARBON, METHOD FOR PRODUCING SAME, ACTIVATED CARBON FIBERS, AND METHOD FOR PRODUCING SAME

#70 | 2025-05-22

US20250163342A1

Chemistry; metallurgy

LUBRICANT COMPOSITION

#71 | 2025-05-22

US20250163244A1

Chemistry; metallurgy

COMPOSITION

#72 | 2025-05-15

US20250154673A1

Chemistry; metallurgy

ADDITIVE FOR CARBON DIOXIDE REDUCTION CATALYSTS, CATALYST LAYER, CATHODE, ION EXCHANGE MEMBRANE-ELECTRODE ASSEMBLY AND SOLID ELECTROLYTE ELECTROLYSIS DEVICE

#73 | 2025-05-08