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| Name of firm | Number of patents (from 1963 until 2002) | Number of citation | Number of self-citation | Number of average self-citation | Number of average self-citation (by two countries) |
1 | American firms | Micron Technology | 15.26 | 18,536 | 0.246 | 12.147 | 9.7232 |
2 | Intel | 365 | 4021 | 0.098 | 11.016 | ||
3 | Motorola | 1439 | 13,087 | 0.248 | 9.095 | ||
4 | IBM | 1390 | 12,104 | 0.252 | 8.708 | ||
5 | AMD | 1023 | 8898 | 0.205 | 8.698 | ||
6 | TI | 1556 | 13,497 | 0.225 | 8.674 | ||
7 | Toshiba | 1829 | 12,989 | 0.171 | 7.102 | ||
8 | Japanese firms | Hitachi | 1037 | 6634 | 0.129 | 6.397 | 5.6705 |
9 | Panasonics (Matsushita) | 624 | 3848 | 0.079 | 6.167 | ||
10 | Fujitsu | 889 | 5387 | 0.085 | 6.060 | ||
11 | Mitsubishi | 1870 | 11,195 | 0.125 | 5.987 | ||
12 | Sharp | 494 | 2928 | 0.055 | 5.927 | ||
13 | Sony | 562 | 3298 | 0.075 | 5.868 | ||
14 | NEC | 1992 | 10,897 | 0.115 | 5.470 | ||
15 |
| Rohm | 213 | 845 | 0.034 | 3.967 | |
16 |
| Sanyo | 186 | 485 | 0.048 | 2.608 |