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Nippon Telephone and Telegraph Corporation

USPTO Granted Patents = 21

Forward Citations = 575

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80 inventors (with patents filed for the assignee):

Toru Murashita (2 out of 8 patents)

Manabu Matsumoto (2 out of 26 patents)

Takashi Ikeguchi (2 out of 21 patents)

4. Kazuo Kuroishi (2 out of 4 patents)

5. Tadasi Sonobe (2 out of 17 patents)

6. Shinjiroo Ueda (2 out of 10 patents)

7. Satoshi Ido (2 out of 5 patents)

8. Satoshi Suzuki (1 out of 180 patents)

9. Hiroyoshi Togo (1 out of 10 patents)

10. Hiroshi Yoshikawa (1 out of 72 patents)

11. Hideki Kamitsuna (1 out of 6 patents)

12. Takahiro Hatano (1 out of 14 patents)

13. Akira Ito (1 out of 41 patents)

14. Katsuhiko Hirabayashi (1 out of 9 patents)

15. Hiroshi Koizumi (1 out of 59 patents)

21 patents: Sort by Forward Citations

1. 9160458 - Optical signal detection circuit and optical receiver (2015-10-13),

2. 7868701 - Transimpedance amplifier (2011-01-11),

3. 7673145 - Biometric image collation apparatus and collation method therefor (2010-03-02),

4. 7557674 - Matrix switch (2009-07-07),

5. 7505644 - Optical memory reproduction apparatus and incidence positioning method for read light thereof (2009-03-17),

6. 7430233 - Spread-spectrum demodulator (2008-09-30),

7. 7412229 - Sales apparatus and method of transmitting and receiving merchandise information by electric field induced in human body (2008-08-12),

8. 7256062 - Semiconductor photo-detector, semiconductor photo-detection device, and production methods thereof (2007-08-14),

9. 6934331 - Brightness-variation compensation method and coding/decoding apparatus for moving pictures (2005-08-23),

10. 6263089 - Method and equipment for extracting image features from image sequence (2001-07-17),

11. 6108467 - Optical switch (2000-08-22),

12. 6045271 - Ferrule for optical connector and method for manufacturing optical (2000-04-04),

13. 5687249 - Method and apparatus for extracting features of moving objects (1997-11-11),

14. 5648859 - Liquid crystal microprism array, free-space optical interconnector, and (1997-07-15),

15. 5363072 - High-frequency power divider-combiner (1994-11-08),

Nippon Telegraph and Telephone Corporation (NTT) is one of the world's largest telecommunications companies providing various services including fixed and mobile phone networks, internet, data centers, and ICT solutions. With a history dating back to 1952, NTT has grown to become a global leader in the industry, serving millions of customers worldwide.

This text is generated by artificial intelligence and may not be accurate.

Company Badge

USPTO Data Jan 1 1976 - Dec 30 2025

21 Patents

#1,137 in Tokyo

#2,800 in Japan

#29,078 in the World

Nippon Telephone and Telegraph Corporation

Forward Citations = 575

80 inventors:

Toru Murashita (2 out of 8 patents)

Manabu Matsumoto (2 out of 26 patents)

Takashi Ikeguchi (2 out of 21 patents)

4. Kazuo Kuroishi (2 out of 4 patents)

5. Tadasi Sonobe (2 out of 17 patents)

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