#

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