Call waiting cancellation device

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 5546451
SERIAL NO

08455517

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A device that links a telecommunication device (for example a data terminal, a telephone instrument, a message terminal or a video terminal) directly to a telephone line for cancellation of a call waiting tone. When an incoming call is received by the linked telecommunication device, the device according to the invention places the interface terminal on hold while maintaining it on line, while a special call waiting cancellation DTMF code such as '*70' is generated and transmitted. Following this action, telecommunication device is returned to the line and the original transmission is allowed to resume.

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Patent Owner(s)

Patent OwnerAddress
AASTRA TECHNOLOGIES INC1685 FLINT ROAD NORTH YORK ONTARIO M3J 2

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Shen, Anthony P Ontario, CA 7 231

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