СПИСОК патентов США - подгруппа МПК16 H04Q1/44
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| № п/п | Номер патента | Название патента | |||
2016 | |||||
| 1 | 9362767 | Portable wireless communication device | |||
2005 | |||||
| 2 | 6888925 | Method for testing large-scale audio conference servers | |||
| 3 | 6882716 | Local control of call features in a telephone system | |||
2002 | |||||
| 4 | 6453153 | Employing customer premises equipment in communications network maintenance | |||
| 5 | 6424925 | Circuit and method for detecting a tone signal | |||
| 6 | 6415139 | Detection circuit of tone signal | |||
2001 | |||||
| 7 | 6195675 | Tone detection using discrete fourier transform techniques | |||
2000 | |||||
| 8 | 6128369 | Employing customer premises equipment in communications network maintenance | |||
| 9 | 6028927 | Method and device for detecting the presence of a periodic signal of known period | |||
1999 | |||||
| 10 | 5887248 | Audible tone signal service apparatus and method of a digital mobile services switching center | |||
1998 | |||||
| 11 | 5850438 | Transmission system with improved tone detection | |||
| 12 | 5850437 | Transmission system with improved tone detection | |||
1997 | |||||
| 13 | 5659606 | Programmable modular apparatus and method for processing digital signals and detecting telephone tones | |||
1996 | |||||
| 14 | 5572588 | Method and apparatus for detecting reception of a tone signal | |||
| 15 | 5563942 | Digital call progress tone detection method with programmable digital call progress tone detector | |||
| 16 | 5530743 | Telephone exchange apparatus and tone sending method in telephone exchange apparatus | |||
1995 | |||||
| 17 | 5479501 | Far-end disconnect detector for telephony systems | |||
| 18 | 5406621 | Telephone tone analysis system | |||
1990 | |||||
| 19 | 4939765 | Interlock circuit for preventing corruption of telephone line signals | |||
| 20 | 4937851 | Loop status verification system | |||
| 21 | 4893332 | Low-powered remote sensor | |||
1989 | |||||
| 22 | 4829562 | Receiver for detecting different fixed frequency signals on a telephone trunkline | |||
1987 | |||||
| 23 | 4639553 | Call signal detecting device | |||
1983 | |||||
| 24 | 4383313 | Tone generator for PAM/TDM telecommunication system | |||
1977 | |||||
| 25 | 4019114 | Circuit arrangement for the ungrounded transmission of signals through testing points in communication facilities | |||
1976 | |||||
| 26 | 3932713 | Induction cancellation circuit | |||
| © 2017, ПАТ-Инфо, В.И. Карнышев
Дата формирования списка: 03.04.2017 | |||||