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Yokohama, Japan

Hitachi Communication Systems, Inc.

USPTO Granted Patents = 17

Forward Citations = 438

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48 inventors (with patents filed for the assignee):

Tomio Furuya (3 out of 21 patents)

Nobuhiro Matsudaira (3 out of 18 patents)

Masao Mizukami (3 out of 21 patents)

4. Nobuaki Kanazawa (3 out of 3 patents)

5. Fuminori Morisawa (2 out of 24 patents)

6. Takayuki Tsutsui (2 out of 104 patents)

7. Kouichi Matsushita (2 out of 8 patents)

8. Masahiro Kumon (2 out of 4 patents)

9. Takuo Tsuzuki (2 out of 7 patents)

10. Masataka Takano (2 out of 7 patents)

11. Masayuki Hashimura (2 out of 3 patents)

12. Mitsuhiro Kotake (2 out of 3 patents)

13. Yoshiharu Kondoh (2 out of 3 patents)

14. Kunihiro Ito (2 out of 2 patents)

15. May Suzuki (1 out of 16 patents)

17 patents: Sort by Forward Citations

1. 7215203 - High frequency power amplifier circuit device (2007-05-08),

2. 7078974 - High frequency power amplifier circuit (2006-07-18),

3. 6976138 - Semiconductor device for data communication control and radio communication apparatus (2005-12-13),

4. 6967535 - High frequency power amplifier circuit (2005-11-22),

5. 6879592 - Switching system and switching control method (2005-04-12),

6. 5880601 - Signal receiving circuit and digital signal processing system (1999-03-09),

7. 5815564 - System for connecting an incoming call to a selected one of a number of (1998-09-29),

8. 5734653 - Cell/ packet assembly and disassembly apparatus and network system (1998-03-31),

9. 5631931 - Bus type clock supplying system for providing a clock in a communication (1997-05-20),

10. 5600630 - Path changing system and method for use in ATM communication apparatus (1997-02-04),

11. 5541992 - System for connecting an incoming call to a selected one of a number of (1996-07-30),

12. 5506783 - Method and apparatusa for determining supply sequence of products ot be (1996-04-09),

13. 5495186 - Differential type MOS transmission circuit (1996-02-27),

14. 5444740 - A ternary signal transmission circuit and method (1995-08-22),

15. 5300798 - Semiconductor integrated circuit device (1994-04-05),

Hitachi Communication Systems, Inc. specializes in advanced communication technologies, focusing on the development and manufacturing of systems that enhance connectivity and data management. The company is known for its innovations in telecommunications infrastructure, network solutions, and cloud services, catering to various industries. Based in Yokohama, Japan, Hitachi Communication Systems leverages its expertise to support digital transformation and improve operational efficiency for clients globally.

Profile summary based on public USPTO records.

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USPTO Data Jan 1 1976 - Sep 29 2026

17 Patents

#58 in Yokohama

#3,225 in Japan

#35,857 in the World

Yokohama, Japan

Hitachi Communication Systems, Inc.

Forward Citations = 438

48 inventors:

Tomio Furuya (3 out of 21 patents)

Nobuhiro Matsudaira (3 out of 18 patents)

Masao Mizukami (3 out of 21 patents)

4. Nobuaki Kanazawa (3 out of 3 patents)

5. Fuminori Morisawa (2 out of 24 patents)

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