4. Telephonic communications
  5. Subscriber line or transmission line interface

Michael Challis

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Circuit protection arrangement

Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent

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Circuit protection device

Electricity: electrical systems and devices – Safety and protection of systems and devices – Voltage regulator protective circuits
Patent

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Communications channel testing arrangement

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of trunk or long line
Patent

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Converter for resistive touchscreens

Computer graphics processing and selective visual display system – Display peripheral interface input device – Touch panel
Reexamination Certificate

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Maintenance termination unit for telephone circuits

Communications: electrical – Continuously variable indicating – With meter reading
Patent

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Profile ID: LFUS-PAI-P-191564

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