H04M1/70

СПИСОК патентов США - подгруппа МПК¹⁶ H04M1/70

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№ п/п	Номер патента	Название патента
2014
1	8650401	Network having quantum key distribution
2013
2	8467525	Steganographic method and device
2011
3	7870393	Steganographic method and device
2008
4	7436957	Audio cassette emulator with cryptographic media distribution control
5	7317796	System and method for video stream encryption
2002
6	6411694	Arrangement for improving a telephone system
1999
7	5926523	Apparatus and method of recognizing establishment of speech channels in communication appliances connected in parallel to a common telephone line
1998
8	5727056	Parallel-connected telephone use determining circuit in a cordless telephone system and method thereof
1996
9	5559873	Telephone privacy device with conference and indicator features
1995
10	5444772	Telephone line lockout device
1993
11	5231658	Telephone privacy device
1991
12	4985916	Party line converter
1990
13	4941166	Muting circuit for telephone answering machine
14	4899372	Multi use telephone extension control circuit and device providing lockout for privacy
1989
15	4825465	Exclusionary device for coupling plural telephonic devices to a single central office trunk
16	4809317	Telephone line exclusion device
17	4807278	Telecommunication controller having a telephone line sharing function
18	4805210	Automatic telephone line sharing and lockout apparatus
1988
19	4747128	Telephone privacy protector
20	4726048	Telephone privacy circuit
21	4723279	Line use indicator in a telephone set
1987
22	4703499	Distributed privacy oriented telephone extension system
23	4647723	Circuit for detection of off-hook condition of extension telephones
1985
24	4528424	Multiparty line adapter with privacy feature controlled by reversal of line polarity at a central power source
1983
25	4368358	Loop sharing in digital systems
1982
26	4332983	Telephone privacy controller
1980
27	4219700	Partyline subscriber interface circuit
28	4218590	Key telephone system having automatic exclusion circuit for line privacy
1979
29	4169217	Line status apparatus for telephones
1977
30	4049914	Frequency division multiplex voice communication apparatus with hierarchy of stations
31	4039759	Line security device
32	4031333	Circuit to indicate the simultaneous off-hook condition of at least two of a plurality of telephone subsets on the same telephone line
© 2017, ПАТ-Инфо, В.И. Карнышев Дата формирования списка: 03.04.2017