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Data communication apparatus

Telephonic communications – Supervisory or control line signaling – Substation originated
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Data communication apparatus including volatile and non-volatile

Telephonic communications – Supervisory or control line signaling – Substation originated
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Data communication method and apparatus including volatile and n

Telephonic communications – Supervisory or control line signaling – Substation originated
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Data storage apparatus

Telephonic communications – Supervisory or control line signaling – Substation originated
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Data transmission apparatus having abbreviated dialing function

Telephonic communications – Supervisory or control line signaling – Substation originated
Reexamination Certificate

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Deformable membrane keypad assembly for public telephones

Telephonic communications – Supervisory or control line signaling – Substation originated
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Detecting whether a telephone line has been disconnected

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
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Detection of both voice and tones using Goertzel filters

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
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Detection of multifrequency tone signals

Telephonic communications – Supervisory or control line signaling – Signal receiver
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Determining the manner in which the wires connecting to a base s

Telephonic communications – Supervisory or control line signaling – Substation originated
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Device and method for cleaning telephone number list

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
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Device for automatically identifying DTMF and FSK for caller ID

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Reexamination Certificate

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Device for detecting DTMF tones

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
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Device for detecting telephone line seizure

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
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Device for detecting tones on telephone lines

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
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Device for identifying line reversal/ringing signal of a telepho

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
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Device for indicating a call to an absent subscriber

Telephonic communications – Supervisory or control line signaling – Substation originated
Reexamination Certificate

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Device for setting and tone dialing a single telephone number

Telephonic communications – Supervisory or control line signaling – Substation originated
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Devices, software and methods for passing DTMF signals under...

Telephonic communications – Supervisory or control line signaling – Signal receiver
Reexamination Certificate

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Dial information storing and redialing method for use in a telep

Telephonic communications – Supervisory or control line signaling – Substation originated
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