by interrupting current to generate trains of pulses by periodically opening and closing contacts to generate trains of pulses

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H04M1/31

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HELECTRICITY H04Electric communication H04MTELEPHONIC COMMUNICATION H04M1/00Substation equipment

Current Industry

H04M1/31by interrupting current to generate trains of pulses by periodically opening and closing contacts to generate trains of pulses

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Patents Grantslast 30 patents

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Plus code dialing in a mobile device
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Circuit for reducing voltage peak in interfacing with a telephone line
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Off-hook signal and dial pulse generating circuit and a method for...
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Device for limiting the working voltage for mechanical switches in...
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Device for limiting the working voltage mechanical switches in tele...
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- Issue date Sep 5, 1995
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Line switch control circuit arrangement for telephone subset
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Telephone branch line transmission circuit with blocking capacitor
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Saturating bipolar switch circuit for telephone dial pulsing
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Circuit for surge voltage protection in electronic telephone stations
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Transient resistant key operated pulse generating calling device ci...
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Subscriber's telephone circuit arranged to present constant impedan...
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Patents Applicationslast 30 patents

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ELECTRIC CIRCUIT ARRANGEMENT AND A METHOD FOR GENERATING ELECTRIC C...
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PLUS CODE DIALING IN A MOBILE DEVICE
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by interrupting current to generate trains of pulses by periodically opening and closing contacts to generate trains of pulses

Industry

Parent Industries

Current Industry

Patents Grantslast 30 patents

Electric circuit arrangement and a method for generating electric c...

Plus code dialing in a mobile device

Circuit for reducing voltage peak in interfacing with a telephone line

Off-hook signal and dial pulse generating circuit and a method for...

Device for limiting the working voltage for mechanical switches in...

Device for limiting the working voltage mechanical switches in tele...

Communication device

Electronic telephone set with low power hook switch

Line switch control circuit arrangement for telephone subset

Telephone subset arrangement

Telephone branch line transmission circuit with blocking capacitor

Circuit for transmitting voice signals and dial pulses

Telephone transmission circuit with improved switching device

Telephone line interface circuit

Electronic headset telephone

Telephone instrument

Telephone line switch

Saturating bipolar switch circuit for telephone dial pulsing

Pulse receiver circuit providing longitudinal balance

Telephone set

Intrinsically safe telephone

Nonsaturating interface supply

Circuit for surge voltage protection in electronic telephone stations

Telephone line interface and dialer circuitry for telecommunication...

Semiconductor integrated circuit having a test circuit for testing...

Surge protected electronic switch for telephone voiceband circuits

Line circuit for network junctor

Opto-coupler interfacing circuit

Transient resistant key operated pulse generating calling device ci...

Subscriber's telephone circuit arranged to present constant impedan...

Patents Applicationslast 30 patents

ELECTRIC CIRCUIT ARRANGEMENT AND A METHOD FOR GENERATING ELECTRIC C...

PLUS CODE DIALING IN A MOBILE DEVICE