H04M1/31

СПИСОК патентов США - подгруппа МПК¹⁶ H04M1/31

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№ п/п	Номер патента	Название патента
2006
1	7006623	Circuit for reducing voltage peak in interfacing with a telephone line
2000
2	6052573	Fixed subscriber unit of wireless local loop system
1999
3	5937030	Off-hook signal and dial pulse generating circuit and a method for driving the same circuit
1997
4	5602914	Device for limiting the working voltage for mechanical switches in telephony
1995
5	5448636	Device for limiting the working voltage mechanical switches in telephony
6	5425096	Communication device
7	5400398	Electronic telephone set with low power hook switch
8	5384837	Line switch control circuit arrangement for telephone subset
1994
9	5317634	Telephone subset arrangement
10	5307403	Telephone branch line transmission circuit with blocking capacitor
11	5280522	Circuit for transmitting voice signals and dial pulses
1992
12	5121425	Telephone transmission circuit with improved switching device
13	5105461	Telephone line interface circuit
1990
14	4975949	Electronic headset telephone
1989
15	4887295	Telephone instrument
16	4815126	Telephone line switch
17	4800585	Saturating bipolar switch circuit for telephone dial pulsing
1988
18	4782520	Pulse receiver circuit providing longitudinal balance
19	4756021	Telephone set
20	4741031	Intrinsically safe telephone
21	4731830	Nonsaturating interface supply
22	4727571	Circuit for surge voltage protection in electronic telephone stations
23	4723267	Telephone line interface and dialer circuitry for telecommunications equipment
1987
24	4697140	Semiconductor integrated circuit having a test circuit for testing an internal circuit
25	4634814	Surge protected electronic switch for telephone voiceband circuits
1986
26	4567329	Line circuit for network junctor
1985
27	4558183	Opto-coupler interfacing circuit
28	4555597	Transient resistant key operated pulse generating calling device circuit
29	4550226	Subscriber's telephone circuit arranged to present constant impedance to a telephone line
30	4527016	Current regulated pulse dialer with memory retention circuit
31	4501932	Solid state electronic dial pulse receiver circuit
1984
32	4475012	Subscriber telephone set incorporating overvoltage protection
1983
33	4413159	Dial pulsing circuit
34	4390753	Line interruption arrangement
35	4388499	Line interruption circuit for use in a telephone set
36	4375583	Indirectly activatable telephone system
1982
37	4360710	Telephone circuit
38	4329546	Interface unit for pushbutton selector
1981
39	4306119	Telephone outpulsing circuit
40	4286120	Current regulated pulse dialer circuit
41	4281220	Telephone dialing and answering device
42	4267409	Keyboard decade digital dial
1980
43	4233475	Telephone station with automatic switch-over between pulse code dialling and multifrequency code dialling
44	4223186	Circuit arrangement for line-supplied subscriber stations having dial devices
45	4199666	Straight line telephone dialer
1979
46	4167655	Push button to rotary dial converter systems
47	4144413	Rotary telephone dial
1978
48	4081619	Switching arrangement for telecommunication subscriber stations using key-operated selection units
1977
49	4046971	Switching arrangement for telephone subsets using impulse-type pushbutton calling
50	4008380	Telephone conversion unit with multiple memory system
51	4008379	Touch-pad to dial conversion unit
1976
52	3988549	Keyboard type telephone station adapted to transmit dialling pulses and multifrequency signals
53	3982079	Touch-to-rotary converter for a telephone instrument
54	3980837	Apparatus for pulsing in telephone sets
55	3973084	Electric impulse transmitters for telephone instruments
56	3969592	Pushbutton-controlled call-number selector for dial-equipped telephone
57	3956596	Circuit arrangements in telephone apparatus
58	3932707	Electric impulse transmitters for telephone instruments
© 2017, ПАТ-Инфо, В.И. Карнышев Дата формирования списка: 03.04.2017