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For the Inventor, By the Inventor

Osaka, Japan

Sankyo Kasei Co., Ltd.

Calculating rank
USPTO Granted Patents = 8

% Expired Patents = 37.5


Forward Citations = 68

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18 inventors (with patents filed for the assignee):

goldMedal Norio Yoshizawa (3 out of 4 patents)

silverMedal Tetsuo Yumoto (3 out of 3 patents)

bronzeMedal Kannosuke Maeda (3 out of 3 patents)

4.  Tatsuo Matsuda (2 out of 13 patents)

5.  Kenichi Urushibata (2 out of 7 patents)

6.  Kiyoto Sugawara (2 out of 4 patents)

7.  Haruo Saen (2 out of 14 patents)

8.  Yoshio Aoyama (2 out of 2 patents)

9.  Tooru Kanno (2 out of 2 patents)

10.  Keiichi Kojima (2 out of 13 patents)

11.  Hiroaki Watanabe (1 out of 32 patents)

12.  Kazuo Takimiya (1 out of 19 patents)

13.  Itaru Osaka (1 out of 4 patents)

14.  Kazuaki Kawashima (1 out of 1 patent)

15.  Toshio Aoyama (1 out of 1 patent)


8 patents:

1. 9209409 - Naphthobisthiadiazole derivative (2015-12-08),
2. 8528202 - Method for manufacturing a three dimensional circuit board (2013-09-10),
3. 7452217 - Connecting member for surface mounting circuit (2008-11-18),
4. 5173088 - Process for preparing crystals of anhydrous sodium sulfide (1992-12-22),
5. 5071632 - Process for preparing crystals of anhydrous sodium sulfide (1991-12-10),
6. 5057650 - Molded circuit component unit for connecting lead wires (1991-10-15),
7. 5045641 - Moulded electrical connector and method for manufacturing same (1991-09-03),
8. 4908043 - Method of producing crystals of anhydrous sodium sulfide (1990-03-13),
Company Overview
Sankyo Kasei Co., Ltd. is a leading manufacturer of specialty chemicals with a focus on providing high-quality products for various industries such as healthcare, cosmetics, and electronics. With over 70 years of experience, the company is known for its innovative solutions and commitment to sustainability. Sankyo Kasei Co., Ltd. continuously strives to exceed customer expectations and create value through its advanced technologies and dedicated team of professionals.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Nov 3 2026

8 Patents

#542 in Osaka

#5,050 in Japan

Osaka, JP
Osaka, Japan

Sankyo Kasei Co., Ltd.

Forward Citations = 68

18 inventors:

goldMedal Norio Yoshizawa (3 out of 4 patents)

silverMedal Tetsuo Yumoto (3 out of 3 patents)

bronzeMedal Kannosuke Maeda (3 out of 3 patents)

4.  Tatsuo Matsuda (2 out of 13 patents)

5.  Kenichi Urushibata (2 out of 7 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Sankyo Kasei Co., Ltd.. Retrieved from https://idiyas.com/company/sankyo-kasei-company

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
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