US4669110A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Call progress tone system
Assignee: Alcatel Lucent NV
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Filing: 1985-10-25
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Granted: 1987-05-26
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Expires: 2005-10-25
Abstract
Abstract A tone source is located at each telephone set of a private branch exchange (PBX) or a key telephone system. The tone source provides call progress tones and warble ring tone, as well as a feedback tone in response to the depression of telephone set keypad buttons by the user. The signaling to the central system unit is transmitted via a digital link.
Inventors
- 👤 Hedayat Daie
- 👤 Charles H. Marsh
- 👤 Joe L. Turner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:55
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/44; H04Q1/444; H04Q1/45; H04M; H04M1/00; H04M1/82; H04Q3/00; H04Q3/58; H04Q3/62; H04Q3/625
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
144 words
A communication system, comprising: means, located at a communication set of said system, for providing tones including call progress tones for said set; means, coupled to said tone means, for coupling control signals for said tone means from a central unit of said system, means, coupled to said tone means, for coupling said tones to an audio unit of said communication sets, wherein said tone means comprises: means for generating a first single frequency; means for generating a second single frequency; means, coupled to said first and second single frequency generating means, for selectively switching between said first and second single frequency generating means to produce one of said tones comprised of a selectable combination over time of said first single frequency and said second single frequency; and means, coupled to said switching means, for providing said switched frequency to said tone coupling means.
Claim 2
Dependent Claim
144 words
A communication system, comprising: means, located at a communication set of said system, for providing tones including call progress tones for said set; means, coupled to said tone means, for coupling control signals for said tone means from a central unit of said system, means, coupled to said tone means, for coupling said tones to an audio unit of said communication sets, wherein said tone means comprises: means for generating a first single frequency; means for generating a second single frequency; means, coupled to said first and second single frequency generating means, for selectively switching between said first and second single frequency generating means to produce one of said tones comprised of a selectable combination over time of said first single frequency and said second single frequency; and means, coupled to said switching means, for providing said switched frequency to said tone coupling means.
Claim 3
Dependent Claim
31 words
A communication system according to claim 1, wherein said tone means further comprises means for generating a confidence tone frequency, in response to depression of a keypad of said communication set.
Claim 4
Dependent Claim
19 words
A communication system according to claim 1, wherein said tones further include ring tones and keypad dialing feedback tones.
Claim 5
Dependent Claim
17 words
A communication system according to claim 1, wherein said control signal coupling means comprises a digital link.
References Cited (Backward Citations)
US4322581A
Cited
US4571462A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-25 | 1990-11-24 | 1991-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-25 | 1994-11-24 | 1995-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-25 | 1998-11-24 | 1999-05-26 | $7700.00 | Window Closed / Lapsed |