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American Government Special Collections Reference Desk

Vehicle Parts Manufacturer

External Links
Official Site: ngkntk.co.jp
Wikipedia: NGK
Page Sections
Article Index
A manufacturer of spark plugs. NGK is an initialism of Nihon Gaishi kabushikigaisha. Founded 26 October 1936 and based in Nagoya, Japan.


The following section is an excerpt from Wikipedia's NGK page on 10 March 2021, text available via the Creative Commons Attribution-ShareAlike 3.0 Unported License.

The NGK Spark Plug Co., Ltd. is a public company established in 1936 and based in Nagoya, Japan. NGK manufactures and sells spark plugs and related products for internal combustion engines, along with ceramics and applicable products.

As of March 2007, the company employed 10,407 people, and operated a network of 7 liaison offices, 12 sales offices, 13 production sites and 2 technical centers worldwide. NGK Spark Plugs was founded as a spin-off of the spark plug division of NGK Insulators. Originally, NGK supplied most of its products to Japanese automakers.

In 2018 the company became a shareholder of aftermarket data firm TecAlliance.

NGK stands for Nihon Gaishi kabushikigaisha, the Japanese name of NGK Insulators.


NGK Advertisement Subject:  NGK Advertisement
Source:  Motor Trend
Date:  August 1965
View 1965 NGK Advertisement - 1,359KB


DateDocument Name & DetailsDocuments
3 July 2012Devices for Detecting Accumulation Amount of Particulates
United States Patent US 8,210,033 B2
Jungo Kondo, Keiji Matsuhiro, Kenji Aoki, and Atsuo Kondo for NGK Insulators, Ltd.

- 899KB - 11 pages
16 July 2013Bonding Agent Comprising Spherical Sintered Metal Oxide Powder
United States Patent US 8,486,328
Makoto Ohmori, Toshiyuki Nakamura, and Takashi Ryu for NGK Insulators, Ltd.

- 4.8MB - 20 pages
6 August 2013Method for Producting Group III Nitride Semiconductor
United States Patent US 8,501,141
Takayuki Sato, Seiji Nagai, Makoto Iwai, Shuhei Higashihara, Yusuke Mori, and Yasuo Kitaoka for Toyota Gosei Co., Ltd., NGK Insulators, Ltd., and Osaka University

- 782KB - 12 pages
6 August 2013Solid Electrolyte Fuel Cell Stack
United States Patent US 8,501,365
Hideki Uematsu, Masahiro Shibata, Hiroshi Sumi, Hiroya Ishikawa and Keizo Furusaki for NGK Spark Plug Co., Ltd.

- 1.1MB - 20 pages
3 September 2015
filing date
United States of America v. NGK Insulators, Ltd.
United States District Court, Eastern District of Michigan

- 210KB - 8 pages

Article Index

19 August 2014NGK Spark Plug Co. Ltd. Agrees to Plead Guilty to Price Fixing and Bid Rigging on Automobile Parts Installed in U.S. CarsU.S. Department of Justice
3 September 2015NGK Insulators Ltd. to Pay $65.3 Million for Fixing Prices on Auto PartsDepartment of Justice, Office of Public Affairs
21 May 2015Current and Former Executives of an Automotive Parts Manufacturer Indicted for Roles in Conspiracy to Fix Prices - Investigation Has Resulted in Charges Against 90 Individuals and CorporationsDepartment of Justice, Office of Public Affairs

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