Issued Patents All Time
Showing 26–50 of 51 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5886979 | Information recording medium and method for recording and reproducing information to a medium to prevent unauthorized copying | Mineo Moribe, Zenichi Nagashima, Hiroyuki Kobayashi, Keiichi Murakami | 1999-03-23 |
| 5875247 | System for decrypting encrypted software | Kazuo Nakashima, Masaru Nakahara, Satoshi Itami | 1999-02-23 |
| 5872751 | Library apparatus and a method for assembly thereof | Mamoru Haneda, Nobuhiko Motoyama, Hiroaki Nishijo, Takahisa Miyamoto, Yutaka Sugai +5 more | 1999-02-16 |
| 5857021 | Security system for protecting information stored in portable storage media | Satoshi Kataoka, Makoto Yoshioka, Keiichi Murakami | 1999-01-05 |
| 5809300 | Removable storage medium and computer system using the same | Koichi Ogawa, Makoto Yoshioka, Satoshi Itami, Kazunori Naito, Kazuo Nakashima | 1998-09-15 |
| 5777965 | Optical disk having an erased-state indicator and optical disk apparatus for reducing frequency of disk-erasing operations | Satoshi Itami, Masaru Nakahara, Masahiro Nakada, Hiroshi Suzuki | 1998-07-07 |
| 5752009 | Recording medium for electronic publications including multiple format emulation | Masaru Nakahara, Kazuo Nakashima | 1998-05-12 |
| 5708650 | Multiple format interchangeable optical recording medium and method of controlling same | Kazuo Nakashima | 1998-01-13 |
| 5684785 | Optical disk and method of preventing fraudulent use of optical disk rotation synchronous control system | Satoshi Itami, Kazuo Nakashima, Kazunori Naito, Satoshi Komura | 1997-11-04 |
| 5654838 | Library apparatus having recording medium entry and ejection units | Nobuhiko Motoyama | 1997-08-05 |
| 5623548 | Transformation pattern generating device and encryption function device | Ryota Akiyama, Naoya Torii, Noboru Iwayama | 1997-04-22 |
| 5617393 | Optical disk having an erased-state indicator and optical disk apparatus for reducing frequency of disk erasing operation | Satoshi Itami, Masaru Nakahara, Masahiro Nakada, Hiroshi Suzuki | 1997-04-01 |
| 5537636 | File management system for a partially rewritable storage medium where file management information is created in a rewritable zone based on medium management information in a read only zone | Yoshiaki Uchida, Masahiro Nakada | 1996-07-16 |
| 5432656 | Library apparatus having recording medium entry and ejection units | Nobuhiko Motoyama | 1995-07-11 |
| 5422871 | Method and apparatus for producing an optical disk having a read-only area and a rewritable area | Kazuo Nakashima, Kazunori Naito | 1995-06-06 |
| 5418852 | Unauthorized use prevention method for optical disks, optical disk having unauthorized use prevention function, and optical disk apparatus | Satoshi Itami, Masahiro Nakada, Hiroshi Suzuki, Kazunori Naito, Kazuo Nakashima +2 more | 1995-05-23 |
| 5357431 | Character string retrieval system using index and unit for making the index | Masahiro Nakada, Takashi Tsubokura, Masaru Nakahara, Satoshi Itami, Hiroshi Suzuki +2 more | 1994-10-18 |
| 5327411 | Write control method and apparatus for writing optical disk data | Seiichi Iwasa, Nagaaki Koshino, Masahiro Nakada | 1994-07-05 |
| 5157647 | Loading and unloading apparatus for a cartridge | — | 1992-10-20 |
| 5144618 | Optical disc medium | Yasuyuki Goto, Nagaaki Koshino, Iwao Tsugawa, Masahiro Nakada | 1992-09-01 |
| 5138572 | Optical information memory medium including indium (In) and bismuth (Bi) | Nagaaki Koshino, Miyozo Maeda, Yasuyuki Goto, Itaru Shibata, Akira Ushioda +2 more | 1992-08-11 |
| 5072423 | Optical information memory medium recording and erasing information including gallium and antimony | Nagaaki Koshino, Miyozo Maeda, Yasuyuki Goto, Itaru Shibata, Akira Ushioda +2 more | 1991-12-10 |
| 5058061 | Method for recording information in an optical information memory medium including indium (In) and Antimony (Sb) | Nagaaki Koshino, Miyozo Maeda, Yasuyuki Goto, Itaru Shibata, Akira Ushioda +2 more | 1991-10-15 |
| 4984232 | Compatible optical disk | Nagaaki Koshino, Yasuyuki Goto, Iwao Tsugawa, Masahiro Nakada | 1991-01-08 |
| 4947372 | Optical information memory medium for recording and erasing information | Nagaaki Koshino, Miyozo Maeda, Yasuyuki Goto, Itaru Shibata, Akira Ushioda +2 more | 1990-08-07 |