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Patent applications and USPTO patent grants for Yamamoto; Etsufumi.The latest application filed is for "tracking error signal generator with dc offset cancellation".
Patent | Date |
---|---|
Tracking error signal generator with DC offset cancellation Grant 5,181,195 - Kume , et al. January 19, 1 | 1993-01-19 |
Optical pickup device for a recording and/or reproducing apparatus Grant 5,181,193 - Kume , et al. January 19, 1 | 1993-01-19 |
Optical pickup device Grant 5,144,614 - Kume , et al. September 1, 1 | 1992-09-01 |
Optical pickup device Grant 4,893,296 - Matsumoto , et al. January 9, 1 | 1990-01-09 |
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