Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9912527 | Communication device, communication system, method for determining path, and program | Kazuo Takagi, Akira Sakurai | 2018-03-06 |
| 9369359 | Diagnostic system | Masaki Umayabashi, Akira Sakurai | 2016-06-14 |
| 9300558 | Delay measurement system and delay measurement method, as well as delay measurement device and delay measurement program | Masaki Umayabashi, Kazuo Takagi | 2016-03-29 |
| 8897308 | Node, a monitoring management method used for a node, and a transfer system, an input circuit and an output circuit | Hiroyuki Takagi, Masaki Umayabashi, Kazuo Takagi, Akira Sakurai, Hiroshi Tanaka | 2014-11-25 |
| 8737401 | Communication using MPLS-ARP messaging | Kazuo Takagi, Akira Sakurai | 2014-05-27 |
| 8737238 | Congestion detecting method and communication node | Masaki Umayabashi, Hiroyuki Takagi, Kazuo Takagi | 2014-05-27 |
| 8731036 | Packet filter-based clock synchronization system, apparatus, and method, and program thereof | Masaki Umayabashi, Kazuo Takagi | 2014-05-20 |
| 8711686 | Packet transmission system and fault recovery method | Kazuo Takagi, Masaki Umayabashi, Akira Sakurai | 2014-04-29 |
| 8693338 | Quality measuring system, quality measuring apparatus, quality measuring method, and program | Ryuichi Ikematsu, Hiroyuki Takagi, Kazuo Takagi | 2014-04-08 |
| 8675665 | Clock synchronization system, its method and program | Masaki Umayabashi, Hideo Yoshimi, Kazuo Takagi, Atsushi Iwata | 2014-03-18 |
| 7831715 | Communication system, communication method, and program | Hideo Yoshimi, Nobuyuki Enomoto, Kazuo Takagi, Atsushi Iwata | 2010-11-09 |