4. Telephonic communications
  5. Subscriber line or transmission line interface
  6. Power supply

Douglas Lawton Youngblood

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Active mode line voltage regulator for ringing subscriber...

Telephonic communications – Subscriber line or transmission line interface
Reissue Patent

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Programmable subscriber line circuit partitioned into high...

Telephonic communications – Subscriber line or transmission line interface – Power supply
Reissue Patent

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Subscriber line interface circuit (SLIC) including a...

Telephonic communications – Subscriber line or transmission line interface
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2171028

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