Richard M. Sachs

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Directional microphone assembly

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Patent

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Method and apparatus for altering a speech signal during a...

Telephonic communications – Special services – Anonymous party
Reexamination Certificate

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Method and apparatus for creating electronic water marks in...

Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate

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Method and apparatus for inserting background sound in a telepho

Telephonic communications – Special services – Service trigger
Patent

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Method of accommodating for carbon/electret telephone set variab

Patent

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Profile ID: LFUS-PAI-P-411593

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