Telephone exchange system

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 5586172
SERIAL NO

08309968

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Abstract

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A telephone exchange system accommodates a plurality of central office lines and a plurality of telephones and records a telephonic communication in a recording area shared by the plurality of telephones. When predetermined conditions are satisfied, the recording is played back or transferred. The shared recording area can be utilized effectively by erasing a recording after it has been transferred, and by detecting the presence of a voice during a telephonic communication and starting and stopping the recording operation based upon the results of detection. The time at which a recording has been made can be comprehended in the form of a voice when the recording is played back.

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Patent Owner(s)

Patent OwnerAddress
CANON KABUSHIKI KAISHAJAPAN

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kakizawa, Katsuhiro Kawasaki, JP 9 105
Ohtsuka, Kuniaki Yokohama, JP 10 345
Ohuchi, Masatomo Kawasaki, JP 6 125
Sakurai, Shigeki Yokohama, JP 21 260
Suzuki, Shoji Atsugi, JP 187 4965
Tanigawa, Yoshihiro Yokohama, JP 10 196

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