H04M1/50

СПИСОК патентов США - подгруппа МПК¹⁶ H04M1/50

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№ п/п	Номер патента	Название патента
1987
1	4639554	Dual-tone multiple-frequency-signal generating apparatus
1986
2	4585909	Transmission circuit for a DTMF-telephone set
3	4571462	Multiple use digital tone generator in telephone
4	4563548	Method and circuit for telephone dialing signal generation
1985
5	4539552	Digital-to-analog converter
6	4532380	Tone signalling adapter for a telephone set
7	4508938	Push-button dial for a telephone
8	4492927	Offset voltage compensation circuit
1984
9	4472601	Control circuit for telephone receiver and transmitter
10	4471170	Non-integer programmable counter
11	4446436	Circuit for generating analog signals
12	4442322	Electronic common switch having an improved receiver mating arrangement
1983
13	4406926	Telephone station circuit using digital tone generation
14	4394743	Tone generation method and apparatus using stored reference calibration coefficients
15	4390754	Tone generator circuit
16	4368432	Sine wave generator for different frequencies
17	4367375	Push-button dial circuit
1982
18	4357496	Keypad logic interface circuit
19	4355210	Sub-miniature tone encoder with automatic number identification
20	4352958	Electronically-switched multifrequency generator with transducer control
21	4349704	Digital multifrequency signal generator
22	4332984	Active speech network circuit for a telephone set
23	4327255	Keypad caller for a telephone set
24	4315108	Integrated circuit chip telephone communication system
1981
25	4306190	Plural frequency signal generator
1980
26	4196318	Electronically-switched multifrequency generator for providing tone signaling
1979
27	4156115	Apparatus and method for a multiple tone code sender system for automatic call initiation
28	4142184	Digital multitone generator for telephone dialing
29	4133983	Electronic network for telephone set
30	4132871	Digitally synthesized multi-frequency signal generator
1978
31	4110568	Dual tone multifrequency generator
32	4110567	Multi-frequency generator using digital technique
33	4088837	Combination telephone and calculator with common keyboard having reversible indicia
34	4068178	Variable frequency waveform synthesizer
1977
35	4061886	Dual tone multiple frequency generator
36	4058805	Digital multitone generator for telephone dialing
37	4056692	Digital tone generator
38	4025865	Frequency-signalling circuit for a telephone
39	4024347	Telephone calculator
40	4017693	Synthesizer of multifrequency code signals
41	4010454	Magnetic bubble signal generator
42	4007459	Multitone pushbutton dial phase shift scanning circuitry
1976
43	4000379	Tone generator
44	3999049	Synthesizer of multifrequency code signals
45	3985966	Method and apparatus for generating digital dual frequency signals
46	3982078	Line matching circuit for use in a tone pushbutton dialling subscriber's set provided with a tone generator
47	3978295	Circuit arrangement for a tone pushbutton selection telephone subscriber set
48	3971896	Two-tone generator using switching transistors in LC resonant circuits controlled by push-button
49	3959604	Digital calling signal tone generating circuitry
50	3941942	Two of eight tone encoder
© 2017, ПАТ-Инфо, В.И. Карнышев Дата формирования списка: 03.04.2017