P

Inventor

NAKAGAWA MASAHIRO

JP53 patents
⚠️ This page may combine multiple inventors who share the name “NAKAGAWA MASAHIRO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

NIPPON TELEGRAPH & TELEPHONE

13 patents
US12204291B2Jan 21, 2025

Time transmission correction device, time transmission system, and delay measurement method

NIPPON TELEGRAPH & TELEPHONE2 citations73
US11722288B2Aug 8, 2023

Time synchronization path selection device and time synchronization path selection method

NIPPON TELEGRAPH & TELEPHONE2 citations71
US9883262B2Jan 30, 2018

Optical network system, optical switch node, master node, and node

NIPPON TELEGRAPH & TELEPHONE3 citations67
US11742976B2Aug 29, 2023

Optical branch insertion device and optical transmission system using optical branch insertion device

NIPPON TELEGRAPH & TELEPHONE1 citations59
US12191904B2Jan 7, 2025

Burst optical relaying device and burst optical relaying method

NIPPON TELEGRAPH & TELEPHONE0 citations50
US11855760B2Dec 26, 2023

Transmission device, time transmission system, and delay compensation method

NIPPON TELEGRAPH & TELEPHONE0 citations50
US11791922B2Oct 17, 2023

Transmission device, time transmission system, and delay compensation method

NIPPON TELEGRAPH & TELEPHONE0 citations50
US11750358B2Sep 5, 2023

Time transmission device and transmission method

NIPPON TELEGRAPH & TELEPHONE0 citations50
US11638228B2Apr 25, 2023

Time comparison device and time quality monitoring method

NIPPON TELEGRAPH & TELEPHONE0 citations50
US11438857B2Sep 6, 2022

Transmission device, time transmission system, and delay measurement method

NIPPON TELEGRAPH & TELEPHONE0 citations50
US11251868B2Feb 15, 2022

Dispersion compensation system and dispersion compensation method

NIPPON TELEGRAPH & TELEPHONE0 citations49
US11757554B2Sep 12, 2023

Optical branch insertion device and optical transmission system using optical branch insertion device

NIPPON TELEGRAPH & TELEPHONE0 citations48
US11652563B2May 16, 2023

Optical demultiplexer, optical separation device, optical transmission system, and optical transmission method

NIPPON TELEGRAPH & TELEPHONE0 citations48

NIKON CORP

12 patents

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD

5 patents

FUKUDA METAL FOIL POWDER

2 patents

OJI PAPER CO

2 patents

MITA INDUSTRIAL CO LTD

2 patents

TOYOTA MOTOR CO LTD

2 patents

SAKATA SEED CORP

2 patents

SULZER METCO JAPAN LTD

1 patent

HOYA CORP

1 patent

NAKAGAWA MASAHIRO

1 patent

TOHO BESLON CO

1 patent

TOSHIBA KK

1 patent

TOSHIBA MACHINE CO LTD

1 patent

SUMITOMO ELECTRIC INDUSTRIES

1 patent

TODA CORP

1 patent

NTT INC

1 patent

YAZAKI CORP

1 patent

Showing the top 50 of 53 patents by PatentIndex Score.