СПИСОК патентов США - подгруппа МПК16 H04Q1/44



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№ п/п Номер патента Название патента

2016

19362767Portable wireless communication device

2005

26888925Method for testing large-scale audio conference servers
36882716Local control of call features in a telephone system

2002

46453153Employing customer premises equipment in communications network maintenance
56424925Circuit and method for detecting a tone signal
66415139Detection circuit of tone signal

2001

76195675Tone detection using discrete fourier transform techniques

2000

86128369Employing customer premises equipment in communications network maintenance
96028927Method and device for detecting the presence of a periodic signal of known period

1999

105887248Audible tone signal service apparatus and method of a digital mobile services switching center

1998

115850438Transmission system with improved tone detection
125850437Transmission system with improved tone detection

1997

135659606Programmable modular apparatus and method for processing digital signals and detecting telephone tones

1996

145572588Method and apparatus for detecting reception of a tone signal
155563942Digital call progress tone detection method with programmable digital call progress tone detector
165530743Telephone exchange apparatus and tone sending method in telephone exchange apparatus

1995

175479501Far-end disconnect detector for telephony systems
185406621Telephone tone analysis system

1990

194939765Interlock circuit for preventing corruption of telephone line signals
204937851Loop status verification system
214893332Low-powered remote sensor

1989

224829562Receiver for detecting different fixed frequency signals on a telephone trunkline

1987

234639553Call signal detecting device

1983

244383313Tone generator for PAM/TDM telecommunication system

1977

254019114Circuit arrangement for the ungrounded transmission of signals through testing points in communication facilities

1976

263932713Induction cancellation circuit
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Дата формирования списка: 03.04.2017