Inventor
NAKAGAWA TADAO
19 patents
⚠️ This page may combine multiple inventors who share the name “NAKAGAWA TADAO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
NIPPON TELEGRAPH & TELEPHONE
5 patentsUS5714896AFeb 3, 1998
Fractional-N frequency divider system
NIPPON TELEGRAPH & TELEPHONE42 citations89
US9621299B2Apr 11, 2017
Coherent communication system, communication method, and transmission method
NIPPON TELEGRAPH & TELEPHONE15 citations84
US9614621B2Apr 4, 2017
Signal generating circuit, optical signal transmitting apparatus, signal receiving circuit, method for establishing optical signal synchronization, and optical signal synchronization system
NIPPON TELEGRAPH & TELEPHONE4 citations73
US9520947B2Dec 13, 2016
Signal generating circuit, optical signal transmitting apparatus, signal receiving circuit, method for establishing optical signal synchronization, and optical signal synchronization system
NIPPON TELEGRAPH & TELEPHONE3 citations73
US5789950AAug 4, 1998
Direct digital synthesizer
NIPPON TELEGRAPH & TELEPHONE14 citations73
NISSHIN KOGYO KK
4 patentsUS4020481AApr 26, 1977
Fluid level alarm device
NISSHIN KOGYO KK43 citations92
US4168613ASep 25, 1979
Oil reservoir device with oil level detector means for a tandem type master cylinder
NISSHIN KOGYO KK32 citations90
US4050549ASep 27, 1977
Disc brake device for motorcycles and the like
NISSHIN KOGYO KK19 citations73
US3946564AMar 30, 1976
Oil-hydraulic servo-motor
NISSHIN KOGYO KK19 citations73
NAKAGAWA TADAO
3 patentsUS8934782B2Jan 13, 2015
Transmission method, reception method, transmitter apparatus, and receiver device
NAKAGAWA TADAO2 citations60
US8855485B2Oct 7, 2014
Frequency offset estimating method and frequency offset estimating apparatus
NAKAGAWA TADAO2 citations60
US8781029B2Jul 15, 2014
Frequency offset estimation apparatus, reception apparatus, frequency offset estimation method, and reception method
NAKAGAWA TADAO0 citations39
ISHIHARA KOICHI
2 patentsUS8929750B2Jan 6, 2015
Signal generating circuit, optical signal transmitting apparatus, signal receiving circuit, method for establishing optical signal synchronization, and optical signal synchronization system
ISHIHARA KOICHI53 citations97
US8787769B2Jul 22, 2014
Chromatic dispersion value calculating apparatus, optical signal receiving apparatus, optical signal transmitting apparatus, and chromatic dispersion value calculation method
ISHIHARA KOICHI5 citations72
NIPPON SEIKI CO LTD
2 patentsYAMAZAKI ETSUSHI
2 patentsUS9178614B2Nov 3, 2015
Method for estimating amount of wavelength dispersion, wavelength dispersion compensation circuit, and receiving device
YAMAZAKI ETSUSHI0 citations35
US8971703B2Mar 3, 2015
Wavelength dispersion amount estimation method, wavelength dispersion compensation circuit, and reception device
YAMAZAKI ETSUSHI0 citations35