Patent US4216356A successfully refreshed from Google Patents.
US4216356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone having separate voice and signaling pairs
Assignee: AT&T Inc
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Filing: 1979-02-21
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Granted: 1980-08-05
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Expires: 1999-02-21
Abstract
Abstract A telephone station set (S1) is arranged to communicate voice signals over a voice communication pair (V1) and to communicate ringing, switchhook supervision and visual signaling over a separate signaling pair (C1). An amplitude and polarity modulated alternating voltage on the signaling pair (C1) provides current flow in one direction for visual signaling while distinguishable amounts of current flow in the opposite direction to provide switchhook and ringing supervision. The switchhook supervision current and the ringing signal current both flow through a series connection of a buzzer (B1) and a break switchhook contact (SH2) in the telephone station set. An off-hook condition at the telephone interrupts current flow on the signaling pair (C1) providing a switchhook supervision signal while simultaneously terminating the ringing signal.
Inventors
- 👤 Edmund T. Burke
- 👤 David F. Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:41
CPC Classifications
H; H04; H04M; H04M9/00; H04M9/002; H04M9/005; H04M9/007
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
97 words
A telephone station set (S1) arranged to communicate voice, control and status signaling over a two pair facility to a connected telephone system characterized in that said telephone station set (S1) includes a communication network means (N1) for providing dialing and voice communications to said telephone system over a voice communication pair (V1) of said two pair facility, and a signaling network means (N2) arranged for providing supervisory analog voltage signaling and for responding to existing analog voltage ringing and visual signaling voltages from said telephone system over a signaling pair (C1) of said two pair facility.
Claim 2
Dependent Claim
97 words
A telephone station set (S1) arranged to communicate voice, control and status signaling over a two pair facility to a connected telephone system characterized in that said telephone station set (S1) includes a communication network means (N1) for providing dialing and voice communications to said telephone system over a voice communication pair (V1) of said two pair facility, and a signaling network means (N2) arranged for providing supervisory analog voltage signaling and for responding to existing analog voltage ringing and visual signaling voltages from said telephone system over a signaling pair (C1) of said two pair facility.
Claim 3
Dependent Claim
52 words
The invention of claim 1 wherein said signaling network means (N2) of said telephone station set (S1) includes means for visually indicating (M1) when a first polarity of voltage exists across said signaling pair (C1), and means for audibly indicating (M2) when a second polarity of voltage exists across said signaling pair.
Claim 4
Dependent Claim
18 words
The invention of claim 2 wherein said visual indicating means (M1) includes a unidirectional light emitting diode (LED1).
Claim 5
Dependent Claim
30 words
The invention of claim 2 wherein said audible indicating means (M2) conducts current but is inoperative for a reduced amplitude of said second polarity of voltage across said signaling pair.
Claim 6
Dependent Claim
28 words
The invention of claim 4 wherein said current flowing through said audible indicating means (M2) provides a supervision current which is interrupted when said station set goes off-hook.
Claim 7
Dependent Claim
26 words
The invention of claim 5 wherein said audible indicating means (M2) includes a unidirectional buzzer means (B1, D1) in series with a break switchhook contact (SH2).
Claim 8
Dependent Claim
90 words
A telephone station set (S1) arranged to communicate with a connected telephone system over a first wire pair (V1) for communicating voice and dialing signals and a second wire pair (C1) for communicating a first analog voltage signal for powering a visual device (LED1) and a second analog voltage signal for powering an audible device (B1) in telephone wherein said first and second signals are derived from existing signals at said telephone system and wherein switchhook signaling is derived from interrupting a supervision current flow on said second wire pair.
Claim 9
Dependent Claim
90 words
A telephone station set (S1) arranged to communicate with a connected telephone system over a first wire pair (V1) for communicating voice and dialing signals and a second wire pair (C1) for communicating a first analog voltage signal for powering a visual device (LED1) and a second analog voltage signal for powering an audible device (B1) in telephone wherein said first and second signals are derived from existing signals at said telephone system and wherein switchhook signaling is derived from interrupting a supervision current flow on said second wire pair.
Claim 10
Dependent Claim
31 words
The invention of claim 7 wherein said first signal is a first half-wave polarity of an alternating voltage and said second signal is a second half-wave polarity of an alternating voltage.
Claim 11
Dependent Claim
13 words
The invention of claim 8 wherein said second signal provides said supervision current.
Claim 12
Dependent Claim
25 words
The invention of claim 7 wherein said supervision current flows through said audible device (B1) of said station set (S1) without operating said audible device.
Claim 13
Dependent Claim
20 words
The invention of claim 7 wherein a break switchhook contact (SH2) of said station set (S1) interrupts said supervision current.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-08-05 | 1984-02-04 | 1984-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-05 | 1988-02-04 | 1988-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-05 | 1992-02-04 | 1992-08-05 | $7700.00 | Window Closed / Lapsed |