H04Q1/446

СПИСОК патентов США - подгруппа МПК¹⁶ H04Q1/446

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№ п/п	Номер патента	Название патента
2002
1	6493432	System for ensuring calling party privacy in a call screening system
2	6385299	Line testing in a telecommunications network
2001
3	6212265	Method and apparatus for electronic mail notification
4	6169783	Line testing in a telecommunications network
1999
5	5920623	Method and apparatus for defeating a predictive telemarketing system
1993
6	5218635	Low-frequency alternating current signal detector, in particular for central office line interface circuits
1991
7	5070526	Signal analyzing system
1990
8	4945555	Method and means for remote testing of unused telephone lines
1988
9	4792985	Transmitters and systems for tone-in-band transmission
1986
10	4567328	Energy detection circuit for a facsimile system controller
1983
11	4384175	Tone detection method and arrangement for observing and classifying repetitive status signals
1978
12	4099125	Frequency error correction circuit
1977
13	4037171	High speed tone decoder utilizing a phase-locked loop
14	4018996	Communication network protection system
© 2017, ПАТ-Инфо, В.И. Карнышев Дата формирования списка: 03.04.2017