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 | |||||