Issued Patents All Time
Showing 26–40 of 40 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7593177 | Recording/reproducing method of magnetic tape | Masao Okafuji, Tsugihiro Doi, Tetsutaro Inoue, Hiroyuki Mitsuhashi, Seigi Kawarai | 2009-09-22 |
| 7545597 | Recording/reproducing method of magnetic tape | Masao Okafuji, Tsugihiro Doi, Tetsutaro Inoue, Hiroyuki Mitsuhashi, Seigi Kawarai | 2009-06-09 |
| 7533848 | Tape reel and magnetic tape cartridge | Motoya Miura, Yasuo Inugai, Shigeru Yasuda, Shihoko Takashima | 2009-05-19 |
| 7494728 | Magnetic tape and magnetic tape cartridge | Tsugihiro Doi, Tetsutaro Inoue, Mikio Kishimoto | 2009-02-24 |
| 7445858 | Magnetic recording medium using magnetic powder having a core portion and an outer layer portion including a rare earth element and magnetic recording cassette | Tsugihiro Doi, Tetsutaro Inoue, Mikio Kishimoto, Yuji Sasaki, Hideaki Watanabe | 2008-11-04 |
| 7291409 | Magnetic recording medium using magnetic powder having a core portion and an outer layer portion including a rare earth element and magnetic recording cassette | Tsugihiro Doi, Tetsutaro Inoue, Mikio Kishimoto, Yuji Sasaki, Hideaki Watanabe | 2007-11-06 |
| 7267896 | Magnetic tape and magnetic tape cartridge | Tsugihiro Doi, Tetsutaro Inoue, Mikio Kishimoto, Yuji Sasaki, Hideaki Watanabe | 2007-09-11 |
| 7253988 | Recording/reproducing method of magnetic tape | Masao Okafuji, Tsugihiro Doi, Tetsutaro Inoue, Hiroyuki Mitsuhashi, Seigi Kawarai | 2007-08-07 |
| 7170709 | Recording/reproducing method of magnetic tape | Masao Okafuji, Tsugihiro Doi, Tetsutaro Inoue, Hiroyuki Mitsuhashi, Seigi Kawarai | 2007-01-30 |
| 7158339 | Recording/ reproducing method and recording/reproducing apparatus for magnetic tape | Manabu Nose, Shihoko Takashima | 2007-01-02 |
| 5725943 | Magnetic tape cartridge | Junichi Hirata, Seigi Kawarai | 1998-03-10 |
| 5051319 | Magnetic recording tape containing low levels of compounds with molecular weights between specified limits determined from gel permeation chromatography of tape extract | Kimihiko Kaneno, Seigi Kawarai | 1991-09-24 |
| 5035947 | Magnetic recording medium including magnetic metallic powder | Seigi Kawarai, Yasushi Orita | 1991-07-30 |
| 4774147 | Magnetic recording medium | Seigi Kawarai | 1988-09-27 |
| 4632867 | Magnetic recording medium | Seigi Kawarai | 1986-12-30 |