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Patents Grants
last 30 patents
Information
Patent Grant
Subscriber's circuit for time division switching system
Patent number
4,592,046
Issue date
May 27, 1986
Iwasaki Tsushinki Kabushiki Kaisha
Yoshihiro Kawata
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Synchronization system for key telephone system
Patent number
4,583,221
Issue date
Apr 15, 1986
Iwasaki Tsushinki K.K.
Seiya Uchida
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Key telephone transmission system
Patent number
4,583,214
Issue date
Apr 15, 1986
Iwasaki Tsushinki Kabushiki Kaisha
Hiroyuki Miyashita
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Facsimile connection system
Patent number
4,558,369
Issue date
Dec 10, 1985
Iwasaki Tsushinki Kabushiki Kaisha
Masaru Shinohara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Control signal transmission system for key telephone system
Patent number
4,551,583
Issue date
Nov 5, 1985
Telegraph & Telephone Pub. Corp.
Koichi Sekiguchi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Time interval measuring system
Patent number
4,523,289
Issue date
Jun 11, 1985
Iwasaki Tsushinki Kabushiki Kaisha
Masafumi Soma
G01 - MEASURING TESTING
Information
Patent Grant
Synchronization system for key telephone system
Patent number
4,502,138
Issue date
Feb 26, 1985
Iwasaki Tsushinki Kabushiki Kaisha
Akiho Doi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Howler tone sending-out system in time-division electronic exchanges
Patent number
4,502,139
Issue date
Feb 26, 1985
Iwasaki Tsushinki Kabushiki Kaisha
Teruo Matsufuji
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Reception system for key telephone system
Patent number
4,490,820
Issue date
Dec 25, 1984
Iwasaki Tsushinki Kabushiki Kaisha
Akiho Doi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Power source circuit
Patent number
4,479,085
Issue date
Oct 23, 1984
Iwasaki Tsushinki Kabushiki Kaisha
Seiya Uchida
G05 - CONTROLLING REGULATING
Information
Patent Grant
Two-way signal transmission and one-way DC power supply using a sin...
Patent number
4,450,571
Issue date
May 22, 1984
Iwasaki Tsushinki Kabushiki Kaisha
Takashi Hirayama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Key telephone system
Patent number
4,410,767
Issue date
Oct 18, 1983
Iwasaki Tsushinki Kabushiki Kaisha
Kouichi Sekiguchi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Waveform searching system
Patent number
4,399,512
Issue date
Aug 16, 1983
Iwasaki Tsushinki Kabushiki Kaisha
Masafumi Soma
G01 - MEASURING TESTING
Information
Patent Grant
Hybrid circuit
Patent number
4,380,690
Issue date
Apr 19, 1983
Iwasaki Tsushinki Kabushiki Kaisha
Teruo Matsufuji
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Push-button dial circuit
Patent number
4,367,375
Issue date
Jan 4, 1983
Iwasaki Tsushinki Kabushiki Kaisha
Yuuji Tsuruga
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Channel switching network
Patent number
4,353,066
Issue date
Oct 5, 1982
Iwasaki Tsushinki Kabushiki Kaisha
Tetsuro Inomata
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Synchronization system for key telephone system
Patent number
4,314,109
Issue date
Feb 2, 1982
Iwasaki Tsushinki Kabushiki Kaisha
Koichi Sekiguchi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Light signal observation device
Patent number
4,289,399
Issue date
Sep 15, 1981
Iwasaki Tsushinki Kabushiki Kaisha
Kozo Uchida
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Key telephone systems
Patent number
4,280,022
Issue date
Jul 21, 1981
Iwasaki Tsushinki Kabushiki Kaisha
Koichi Sekiguchi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Key telephone system
Patent number
4,254,306
Issue date
Mar 3, 1981
Iwasaki Tsushinki Kabushiki Kaisha
Kouichi Sekiguchi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Key telephone system
Patent number
4,234,765
Issue date
Nov 18, 1980
Iwasaki Tsushinki Kabushiki Kaisha
Kouichi Sekiguchi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Waveform comparison and display system using cathode ray tube
Patent number
4,225,810
Issue date
Sep 30, 1980
Iwasaki Tsushinki Kabushiki Kaisha
Takanori Ushiro
G01 - MEASURING TESTING
Information
Patent Grant
System for receiving remote control signal in automatic telephone a...
Patent number
4,203,007
Issue date
May 13, 1980
Iwasaki Tsushinki Kabushiki Kaisha
Nobuyoshi Hatori
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Remote-controllable automatic telephone answering device
Patent number
4,192,971
Issue date
Mar 11, 1980
Iwasaki Tsushinki Kabushiki Kaisha
Eiji Morigami
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Ringing signal detector
Patent number
4,184,053
Issue date
Jan 15, 1980
Iwasaki Tsushinki Kabushiki Kaisha
Norio Saneyoshi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Rotary telephone dial
Patent number
4,144,413
Issue date
Mar 13, 1979
Iwasaki Tsushinki Kabushiki Kaisha
Tadashi Kodama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Key telephone system
Patent number
4,092,501
Issue date
May 30, 1978
Iwasaki Tsushinki Kabushiki Kaisha
Akihiko Suzuki
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Key telephone system
Patent number
4,027,110
Issue date
May 31, 1977
Iwasaki Tsushinki Kabushiki Kaisha
Hikaru Takematsu
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Amplitude-limiter
Patent number
4,008,440
Issue date
Feb 15, 1977
Iwasaki Tsushinki Kabushiki Kaisha
Shigeyuki Mizukoshi
H03 - BASIC ELECTRONIC CIRCUITRY
Information
Patent Grant
System for detecting the transmission direction of a signal on a tw...
Patent number
3,974,401
Issue date
Aug 10, 1976
Iwasaki Tsushinki Kabushiki Kaisha
Hisashi Eguchi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Patents Applications
last 30 patents
Trademark
last 30 trademarks
Information
Trademark
78230086 - ELEFAX
Serial number
78230086
Registration number
2958049
Filing date
Mar 26, 2003
IWASAKI TSUSHINKI KABUSHIKI KAISHA (IWATSU ELECTRIC CO., LTD)
1 - Chemicals used in industry, science and photography, as well as in agriculture, horticulture and forestry
Information
Trademark
75134709 - IWATSU
Serial number
75134709
Registration number
2237131
Filing date
Jul 10, 1996
IWASAKI TSUSHINKI KABUSHIKI KAISHA
9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
Information
Trademark
75134708 - IWATSU
Serial number
75134708
Registration number
2123065
Filing date
Jul 10, 1996
IWASAKI TSUSHINKI KABUSHIKI KAISHA (IWATSU ELECTRIC CO., LTD.)
7 - Machines and machine tools