Issued Patents All Time
Showing 1–22 of 22 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8284512 | Recording medium and apparatus for protecting copyrighted digital data | Koichi Sugiyama | 2012-10-09 |
| 7359137 | Recording medium and apparatus for protecting copyrighted digital data | Koichi Sugiyama | 2008-04-15 |
| 7277248 | Recording medium and apparatus for protecting copyrighted digital data | Koichi Sugiyama | 2007-10-02 |
| 7265927 | Recording medium and apparatus for protecting copyrighted digital data | Koichi Sugiyama | 2007-09-04 |
| 7236320 | Recording medium and apparatus for protecting copyrighted digital data | Koichi Sugiyama | 2007-06-26 |
| 6894860 | Recording medium and apparatus for protecting copyrighted digital data | Koichi Sugiyama | 2005-05-17 |
| 6873485 | Recording medium and apparatus for protecting copyrighted digital data | Koichi Sugiyama | 2005-03-29 |
| 6778344 | Recording medium and apparatus for protecting copyrighted digital data | Koichi Sugiyama | 2004-08-17 |
| 6744584 | Recording medium and apparatus for protecting copyrighted digital data | Koichi Sugiyama | 2004-06-01 |
| 6744588 | Recording medium and apparatus for protecting copyrighted digital data | Koichi Sugiyama | 2004-06-01 |
| 6687076 | Recording medium and apparatus for protecting copyrighted digital data | Koichi Sugiyama | 2004-02-03 |
| 6490113 | Recording medium and apparatus for protecting copyrighted digital data | Koichi Sugiyama | 2002-12-03 |
| 6437933 | Recording medium for protecting copyrighted data | Koichi Sugiyama | 2002-08-20 |
| 5923486 | Recording and reproducing system for protecting copyrighted data | Koichi Sugiyama | 1999-07-13 |
| 5381358 | Cyclic digital filter | — | 1995-01-10 |
| 5287196 | Method and apparatus for recording video information signals to avoid interference during after-recording | Keitaro Yamashita | 1994-02-15 |
| 5276562 | Emphasis apparatus disposed in either a record or playback system having triple weight coefficient generating devices | — | 1994-01-04 |
| 5276403 | Nonlinear preemphasis-deemphasis system | — | 1994-01-04 |
| 5267022 | Video signal processing apparatus for videotape recorder/reproducer capable of effecting vertical (and horizontal) emphasis and deemphasis on chrominance signals | Masatoshi Takashima | 1993-11-30 |
| 5200835 | Demodulator for FM modulated video signals with pre-demodulation sideband suppression and post-demodulation sideband restoration | — | 1993-04-06 |
| 5119199 | FM demodulator for video tape recorder | — | 1992-06-02 |
| 5105274 | Circuits for reducing noise in a video signal | — | 1992-04-14 |