Inventor
SAKAMOTO NORIHIRO
JP14 patents
⚠️ This page may combine multiple inventors who share the name “SAKAMOTO NORIHIRO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
4 patentsUS8005362B2Aug 23, 2011
Passive optical network system and optical line terminal
HITACHI LTD6 citations73
US7725031B2May 25, 2010
Passive optical network system and ranging system thereof
HITACHI LTD7 citations73
US7711268B2May 4, 2010
Passive optical network system and ranging system thereof
HITACHI LTD5 citations73
US8374503B2Feb 12, 2013
Passive optical network system and optical line terminal
HITACHI LTD0 citations52
HITACHI COMM TECH LTD
3 patentsUS7620325B2Nov 17, 2009
Transmission apparatus with function of multi-step bandwidth assignment to other communication apparatuses
HITACHI COMM TECH LTD28 citations92
US7512341B2Mar 31, 2009
Passive optical network system and ranging system thereof
HITACHI COMM TECH LTD4 citations73
US7489869B2Feb 10, 2009
Passive optical network system and ranging system thereof
HITACHI COMM TECH LTD7 citations73
KAZAWA TOHRU
3 patentsUS8811819B2Aug 19, 2014
Optical multiplexing terminal device, wavelength multiplexing passive optical network system and downlink wavelength transmission method
KAZAWA TOHRU16 citations83
US8477800B2Jul 2, 2013
Passive optical network system and operation method thereof
KAZAWA TOHRU5 citations72
US8724995B2May 13, 2014
Passive optical network system and operating method thereof
KAZAWA TOHRU3 citations62