Issued Patents All Time
Showing 26–40 of 40 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6069543 | Dielectric resonator capable of varying resonant frequency | Yohei Ishikawa, Toshiro Hiratsuka, Kenichi Iio | 2000-05-30 |
| 6016090 | Dielectric resonator apparatus and high-frequency module | Kenichi Iio, Koichi Sakamoto, Toshihiro HIRATSUKA, Tomiya Sonoda, Shigeyuki Mikami | 2000-01-18 |
| 5986527 | Planar dielectric line and integrated circuit using the same line | Yohei Ishikawa, Toshiro Hiratsuka, Kenichi Iio | 1999-11-16 |
| 5945894 | Dielectric resonator and filter utilizing a non-radiative dielectric waveguide device | Yohei Ishikawa, Toshiro Hiratsuka, Kenichi Iio | 1999-08-31 |
| 5920245 | Nonradiative dielectric line apparatus including a specifically oriented circuit board | Yohei Ishikawa, Toru Tanizaki, Hiroshi Nishida, Atsushi Saitoh | 1999-07-06 |
| 5872485 | Dielectric line waveguide which forms electronic circuits | Yohei Ishikawa, Koichi Sakamoto, Takehisa Kajikawa | 1999-02-16 |
| 5786740 | Dielectric resonator capable of varying resonant frequency | Yohei Ishikawa, Toshiro Hiratsuka, Kenichi Iio | 1998-07-28 |
| 5770989 | Nonradiative dielectric line apparatus and instrument for measuring characteristics of a circuit board | Yohei Ishikawa, Toru Tanizaki, Hiroshi Nishida, Atsushi Saitoh | 1998-06-23 |
| 5764116 | Dielectric resonator and filter utilizing a nonradiative dielectric waveguide device | Yohei Ishikawa, Toshiro Hiratsuka, Kenichi Iio | 1998-06-09 |
| 5408690 | Antenna supervising apparatus comprising a standing wave ratio measuring unit | Youhei Ishikawa, Hidekazu Wada | 1995-04-18 |
| 5235294 | Auto-tuned apparatus for band-pass filter | Youhei Ishikawa, Hidekazu Wada, Hiroyuki Kubo | 1993-08-10 |
| 4996506 | Band elimination filter and dielectric resonator therefor | Youhei Ishikawa, Toshiro Hiratsuka, Hirotsugu Abe, Hisashi Takagaki | 1991-02-26 |
| 4740765 | Dielectric filter | Youhei Ishikawa, Kikuo Tsunoda, Toshiro Hiratsuka, Kazuyoshi Miyawaki | 1988-04-26 |
| 4636759 | Electrical trap construction | Youhei Ishikawa, Tadahiro Yorita | 1987-01-13 |
| 4223361 | Magnetic recording medium | Hiroshi Zaitsu, Takashi Yamase, Kunio Mizushima | 1980-09-16 |