Inventor
Takefumi Oguma
Inventor
Tokyo, JP
Overview
Patents· 15 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
H04Bprimary
H04BTransmission31%
H04JMultiplex communication22%
G02BOptical elements, systems or apparatus19%
G02FOptical devices or arrangements for the control of light by modification of the optical properties of the media of the elements involved therein6%
F25BRefrigeration machines, plants or systems3%
F25DRefrigerators3%
G01KMeasuring temperature3%
G05DSystems for controlling or regulating non-electric variables3%
H04QSelecting3%
H05BElectric heating3%
PatentTitleYear
10,659,165Optical transmission device202010,539,741Optical device with optical filters and processing method of optical signals20208,879,908'Optical channel monitor'20148,837,939'Wavelength division multiplexing transmission system, optical channel monitor and optical channel monitoring method'20148,238,745'Collection of data from an optical channel monitor without causing a malfunction of a transmission apparatus'20128,135,280'Method and system for power stability control in wavelength division multiplexing networks'20128,095,011'Wavelength division multiplexing filter, wavelength division multiplexing system, and wavelength division multiplexing method'20127,649,162'Optical feedback control unit, optical communication system, feedback control method, and recording medium for recording program'20107,389,032'Method and apparatus for adjusting loss caused by optical fiber curvature, and optical transmission system using the same'20087,127,183'Output monitor/control apparatus and optical communication system'20066,911,627'Heating element device, heating element mounted structure, temperature control circuit, temperature control apparatus, and module'20056,601,401'Temperature controller and light-waveguide with the same'20036,597,483'Laser oscillation wavelength monitoring device'20035,936,768'Optical passive device for an optical fiber amplifier and the optical amplifier'19995,880,874'Optical equalizer and optical amplifier and wavelength multiple optical transmission apparatus using optical equalizer'1999Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1999–2020Patents assigned to NEC CORP (14)· patent assignee history
1999–2020Based in Tokyo, JP· patent location history
2010–2014Patents assigned to OGUMA TAKEFUMI (6)· patent assignee history
2010Patents assigned to ASAHI KOJI (1)· patent assignee history
2010Based in Minato-ku, JP· patent location history
2012Patents assigned to MATSUDA OSAMU (1)· patent assignee history
2012Patents assigned to MINO KATSUYUKI (1)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| NEC CORP | 14 | 1999–2020 |
| OGUMA TAKEFUMIself | 6 | 2010–2014 |
| ASAHI KOJI | 1 | 2010 |
| MATSUDA OSAMU | 1 | 2012 |
| MINO KATSUYUKI | 1 | 2012 |
Locations
| Location | Patents | Span |
|---|---|---|
| Tokyo, JP | 14 | 1999–2020 |
| Minato-ku, JP | 1 | 2010 |