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For the Inventor, By the Inventor

Nagoya, Japan

Nkg Spark Plug Co., Ltd.

Calculating rank
USPTO Granted Patents = 6

% Expired Patents = 33.3

Forward Citations = 23

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15 inventors (with patents filed for the assignee):

goldMedal Kazuo Kondo (1 out of 44 patents)

silverMedal Kenji Ito (1 out of 88 patents)

bronzeMedal Takio Kojima (1 out of 25 patents)

4.  Tadashi Shingaki (1 out of 5 patents)

5.  Junichi Ichikawa (1 out of 3 patents)

6.  Takashi Oba (1 out of 4 patents)

7.  Hisashi Koduka (1 out of 1 patent)

8.  Kazuhisa Itakura (1 out of 7 patents)

9.  Norihisa Kitajima (1 out of 1 patent)

10.  Naomasa Wakita (1 out of 11 patents)

11.  Asao Morikawa (1 out of 19 patents)

12.  Mitsuyoshi Kawamura (1 out of 19 patents)

13.  Shigeaki Akao (1 out of 7 patents)

14.  Hisashi Ito (1 out of 1 patent)

15.  Hidetoshi Baba (1 out of 1 patent)


6 patents:

1. 7094720 - Dielectric ceramic composition and dielectric resonator made from the composition (2006-08-22),
2. 6831530 - Monolithic LC filter with enhanced magnetic coupling between resonator inductors (2004-12-14),
3. 5122768 - Compact stripline filter with fixed capacity between coupled resonator (1992-06-16),
4. 5003131 - Connection structure between ceramic body and outer terminal (1991-03-26),
5. 4785720 - Lubrication mechanism for piston pin and snap ring (1988-11-22),
6. 4777155 - Sintered member of aluminum nitride base reinforced composite material (1988-10-11),
Company Overview
NKG Spark Plug Co., Ltd. is a leading manufacturer of spark plugs and related products. The company has been producing high-quality spark plugs for automotive, motorbike, and other applications for over 80 years. NKG Spark Plug Co., Ltd. has a strong reputation for innovation, reliability, and performance in the industry.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 27 2026

6 Patents

#97 in Nagoya

#5,990 in Japan

Nagoya, JP
Nagoya, Japan

Nkg Spark Plug Co., Ltd.

Forward Citations = 23

15 inventors:

goldMedal Kazuo Kondo (1 out of 44 patents)

silverMedal Kenji Ito (1 out of 88 patents)

bronzeMedal Takio Kojima (1 out of 25 patents)

4.  Tadashi Shingaki (1 out of 5 patents)

5.  Junichi Ichikawa (1 out of 3 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Nkg Spark Plug Co., Ltd.. Retrieved from https://idiyas.com/company/nkg-spark-plug-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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