СПИСОК патентов США - подгруппа МПК16 H04Q1/444
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| № п/п | Номер патента | Название патента | |||
2005 | |||||
| 1 | 6888925 | Method for testing large-scale audio conference servers | |||
2003 | |||||
| 2 | 6650627 | Tone detection in communication networks | |||
2002 | |||||
| 3 | 6366652 | Method and apparatus for using a VM tone to prevent a voice announcement in a group call | |||
2001 | |||||
| 4 | 6172985 | Automatic detection of pots line | |||
2000 | |||||
| 5 | 6154645 | Method and apparatus for using a MS tone to prevent a voice announcement in a group call | |||
| 6 | 6122652 | Tone and periodical signal detection | |||
1998 | |||||
| 7 | 5790653 | Line-powered detection of call progress tones | |||
| 8 | 5764758 | Interrupted tone converter | |||
| 9 | 5719932 | Signal-recognition arrangement using cadence tables | |||
1994 | |||||
| 10 | 5363443 | Differing frequency sine wave generation from a look-up table | |||
| 11 | 5353344 | Method of determining levels at given frequencies of a VF signal | |||
| 12 | 5353342 | Adaptive multitone signaling method | |||
| 13 | 5349254 | Call progress detection circuit | |||
| 14 | 5311589 | Apparatus and method for audible signaling tone recognition | |||
| 15 | 5311588 | Call progress detection circuitry and method | |||
1993 | |||||
| 16 | 5263081 | Method and apparatus for providing on-hook transmission for digital loop carrier channel units | |||
| 17 | 5251256 | Independent hysteresis apparatus for tone detection | |||
| 18 | 5241579 | Status management method of a signalling service device in an electric switching system | |||
1992 | |||||
| 19 | 5127004 | Tone and announcement message code generator for a telephonic switching system and method | |||
1990 | |||||
| 20 | 4912755 | Line current test device | |||
1989 | |||||
| 21 | 4868872 | Telephone tone detector | |||
| 22 | 4811386 | Called party response detecting apparatus | |||
1987 | |||||
| 23 | 4686699 | Call progress monitor for a computer telephone interface | |||
1982 | |||||
| 24 | 4313038 | DTMF Signal receiver | |||
1980 | |||||
| 25 | 4219699 | Telephone supervision system using DTMF signals | |||
| 26 | 4204094 | Tone applying line circuit | |||
1977 | |||||
| 27 | 4051385 | Active networks and signalling equipment | |||
| 28 | 4002848 | Toll fraud eliminator for telephone systems | |||
| © 2017, ПАТ-Инфо, В.И. Карнышев
Дата формирования списка: 03.04.2017 | |||||