Showing 1–19 of 19 inventors
| Rank | Inventor | Primary Company | Patents |
|---|---|---|---|
| 1 | Kuniharu Tanaka | Ngk Spark Plug Co. | 5 |
| 2 | Masaki Nakagawa | Ricoh Company | 4 |
| 3 | Hiroshi Inagaki | Ngk Spark Plug Co. | 3 |
| 3 | Seiji Oya | Ngk Spark Plug Co. | 3 |
| #5 | Yasuhiko Suzuki | Mitsui Chemicals | 2 |
| #5 | Masayuki Motomura | Ngk Spark Plug Co. | 2 |
| #5 | Akio Saiki | Toyota Industries | 2 |
| #5 | Tomonori Uemura | Ngk Spark Plug Co. | 2 |
| #5 | Hironori Koyama | Tokai Rubber Industries | 2 |
| #10 | Kaname Miwa | Ngk Spark Plug Co. | 1 |
| #10 | Tatsuhiko MURAOKA | Ngk Spark Plug Co. | 1 |
| #10 | Morikuni Kimura | Yamazaki Mazak | 1 |
| #10 | Tokifumi Tanaka | Brother Kogyo | 1 |
| #10 | Akiyoshi Satake | Okuma | 1 |
| #10 | Ryuji Utsuno | Aoyama Seisakusho Co. | 1 |
| #10 | Yasuyuki Ohdaira | Kabushikikaisha Taiheiseisakusho | 1 |
| #10 | Kazutoshi Itoh | Ckd | 1 |
| #10 | Shinji Shibata | Toto | 1 |
| #10 | Masaki Mizutani | Canon | 1 |