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Kawaguchi, Japan

Yasuyuki Ishikawa

USPTO Granted Patents = 9

Average Co-Inventor Count = 1.9

ph-index = 8

Forward Citations = 252(Granted Patents)

Location History:

Kawaguchi, JA (1976)
Kawaguchi, JP (1981 - 1987)
Yokohama, JP (1988 - 1989)

Company Filing History:

9 out of 90,594

Canon Kabushiki Kaisha

Years Active: 1976-1989

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9 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 4812033 - Ophthalmic apparatus (1989-03-14),

2. 4755041 - Eye refractive power measuring apparatus (1988-07-05),

3. 4678297 - Ophthalmic instrument (1987-07-07),

4. 4533222 - Eye examining instrument (1985-08-06),

5. 4421391 - Auto eye-refractometer (1983-12-20),

6. 4376573 - Apparatus for measuring the refractive power of the eye (1983-03-15),

7. 4372655 - Automatic eye-refractometer (1983-02-08),

8. 4293198 - Eye refractometer (1981-10-06),

9. 3942745 - Tape reel drive apparatus with driving torque control mechanism (1976-03-09),

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