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Hiroyuki Masuda
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Sano, JP
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last 30 patents
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Patent Grant
Voice switch used in hands-free communications system
Patent number
5,940,499
Issue date
Aug 17, 1999
Fujitsu Limited
Kensaku Fujii
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Speaking apparatus having handfree conversation function
Patent number
5,479,502
Issue date
Dec 26, 1995
Fujitsu Limited
Juro Ohga
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Hands-free telephone set
Patent number
5,384,843
Issue date
Jan 24, 1995
Fujitsu Limited
Hiroyuki Masuda
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Echo path transition detection
Patent number
5,237,562
Issue date
Aug 17, 1993
Fujitsu Limited
Kensaku Fujii
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Adaptive digital filter including low-pass filter
Patent number
5,146,470
Issue date
Sep 8, 1992
Fujitsu Limited
Kensaku Fujii
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Electronic telephone terminal having noise suppression function
Patent number
4,908,855
Issue date
Mar 13, 1990
Fujitsu Limited
Juro Ohga
H04 - ELECTRIC COMMUNICATION TECHNIQUE