Inventor
Hitoshi Obara
Inventor
Yokohama, JP
Overview
Patents· 6 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
G02Bprimary
G02BOptical elements, systems or apparatus21%
H04BTransmission21%
H04JMultiplex communication14%
H04QSelecting14%
G03FPhotomechanical production of textured or patterned surfaces, e.g. for printing, for processing of semiconductor devices7%
H04LTransmission of digital information, e.g. telegraphic communication7%
H10PGeneric processes or apparatus for the manufacture or treatment of devices covered by class h107%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests7%
PatentTitleYear
8,059,640'Multistage switch control circuit'20117,433,594'Node apparatus, optical wavelength division multiplexing network, and system switching method'20087,164,861'Node apparatus, optical wavelength division multiplexing network, and system switching method'20076,157,025'Disk shaped tunable optical filter'20005,696,623'UV exposure with elongated service lifetime'19975,617,234'Multiwavelength simultaneous monitoring circuit employing arrayed-waveguide grating'1997Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1997–2008Patents assigned to NIPPON TELEGRAPH & TELEPHONE (4)· patent assignee history
1997Patents assigned to FUJITSU LTD (1)· patent assignee history
1997–2008Based in Yokohama, JP· patent location history
1997Based in Kawasaki, JP· patent location history
2000Based in Tokyo, JP· patent location history
2011Patents assigned to NAT UNIVERSITY CORP AKITA UNIVERSITY (1)· patent assignee history
2011Patents assigned to OBARA HITOSHI (1)· patent assignee history
2011Patents assigned to SAKATA MASATO (1)· patent assignee history
2011Based in Akita, JP· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| NIPPON TELEGRAPH & TELEPHONE | 4 | 1997–2008 |
| FUJITSU LTD | 1 | 1997 |
| NAT UNIVERSITY CORP AKITA UNIVERSITY | 1 | 2011 |
| OBARA HITOSHIself | 1 | 2011 |
| SAKATA MASATO | 1 | 2011 |
Locations
| Location | Patents | Span |
|---|---|---|
| Yokohama, JP | 3 | 1997–2008 |
| Akita, JP | 1 | 2011 |
| Tokyo, JP | 1 | 2000 |
| Kawasaki, JP | 1 | 1997 |