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Nippon Telegraph & Telephone Co.

USPTO Granted Patents = 16

EPO Patents = 4

Forward Citations = 389

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81 inventors (with patents filed for the assignee):

Shigenori Yanagi (2 out of 117 patents)

Kumiko Ohmori (2 out of 4 patents)

Masanobu Higashida (2 out of 2 patents)

4. Noriko Mizusawa (2 out of 2 patents)

5. Katsuya Takemura (1 out of 81 patents)

6. Tsuyoshi Hayashi (1 out of 13 patents)

7. Hideki Sakamoto (1 out of 13 patents)

8. Hideharu Suzuki (1 out of 10 patents)

9. Toshio Suzuki (1 out of 51 patents)

10. Yoshio Kawai (1 out of 110 patents)

11. Kazuto Noguchi (1 out of 12 patents)

12. Manabu Yamamoto (1 out of 35 patents)

13. Akinobu Tanaka (1 out of 40 patents)

14. Kenji Kawano (1 out of 17 patents)

15. Makoto Takayanagi (1 out of 3 patents)

16 patents: Sort by Forward Citations

1. 7889866 - Information leakage prevention apparatus and information leakage prevention method (2011-02-15),

2. 7493047 - Transceiver suitable for data communications between wearable computers (2009-02-17),

3. 7286988 - Speech recognition based interactive information retrieval scheme using dialogue control to reduce user stress (2007-10-23),

4. 6885990 - Speech recognition based on interactive information retrieval scheme using dialogue control to reduce user stress (2005-04-26),

5. 6363375 - Classification tree based information retrieval scheme (2002-03-26),

6. 5960138 - Backplane connector (1999-09-28),

7. 5721772 - Subband acoustic echo canceller (1998-02-24),

8. 5633848 - Method and apparatus for cleaning an optical disk head on the basis of (1997-05-27),

9. 5612790 - Method and apparatus for multiplexed video data reading in video library (1997-03-18),

10. 5612170 - Positive resist composition (1997-03-18),

11. 5499223 - Beam position control system of an optical disk unit (1996-03-12),

12. 5220703 - Combination of optical connector cleaner and holder jig (1993-06-22),

13. 5202906 - Frequency divider which has a variable length first cycle by changing a (1993-04-13),

14. 5146178 - Impedance-matched, class F high-frequency amplifier (1992-09-08),

15. 5129017 - Electrically controlled optical device (1992-07-07),

Nippon Telegraph & Telephone Corporation (NTT) is a leading telecommunications company based in Japan. It provides a wide range of services including fixed and mobile telephony, internet services, and data communication. NTT is known for its innovative technology solutions and commitment to driving digital transformation in various industries.

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

Company Badge

USPTO Data Jan 1 1976 - Dec 9 2025

16 Patents

#1,307 in Tokyo

#3,261 in Japan

#36,634 in the World

Nippon Telegraph & Telephone Co.

Forward Citations = 389

81 inventors:

Shigenori Yanagi (2 out of 117 patents)

Kumiko Ohmori (2 out of 4 patents)

Masanobu Higashida (2 out of 2 patents)

4. Noriko Mizusawa (2 out of 2 patents)

5. Katsuya Takemura (1 out of 81 patents)

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