US4852158A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone system allowing hold releasing request from central office line
Assignee: Toshiba Corp
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Filing: 1988-01-27
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Granted: 1989-07-25
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Expires: 2008-01-27
Abstract
Abstract A telephone system which allows external releasing of a holding state set by a holding operation of a telephone set. A signal receiving circuit of the system receives a holding-state releasing signal such as a DTMF signal or the like sent from a central office line to release the hold state of the telephone set on the basis of an output of the circuit.
Inventors
- 👤 Masayuki Tsurusaki
- 👤 Tamotsu Wakabayashi
- 👤 Hiroshi Mano
- 👤 Hideyasu Mori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:14
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04; H04Q3/00; H04Q3/58; H04Q3/62; H04Q3/625; H04Q3/627
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
91 words
A telephone system comprising: means for separating a telephone set from a telephone line and sending a holding tone to said telephone line in response to a holding operation of said telephone set, said telephone line being placed in a holding mode when said telephone set is separated from said telephone line; means connected to said telephone line in said holding mode for detecting a hold releasing signal from said telephone line; and means for automatically releasing said holding mode in response to a detection output of said hold-releasing-signal detecting means.
Claim 2
Dependent Claim
91 words
A telephone system comprising: means for separating a telephone set from a telephone line and sending a holding tone to said telephone line in response to a holding operation of said telephone set, said telephone line being placed in a holding mode when said telephone set is separated from said telephone line; means connected to said telephone line in said holding mode for detecting a hold releasing signal from said telephone line; and means for automatically releasing said holding mode in response to a detection output of said hold-releasing-signal detecting means.
Claim 3
Dependent Claim
27 words
A telephone system as set forth in claim 1, wherein said hold releasing signal is a DTMF signal and said hold-releasing-signal detecting means includes a DTMF receiver.
Claim 4
Dependent Claim
41 words
A telephone system as set forth in claim 1 wherein said hold-releasing-signal detecting means includes a detection circuit for detecting said hold releasing signal and a switch circuit for connecting said detection circuit to said telephone line in said holding mode.
Claim 5
Dependent Claim
37 words
A telephone system as set forth in claim 1, wherein said holding-mode releasing means includes means for connecting said telephone set to said telephone line and means for turning on a talking circuit of said telephone set.
Claim 6
Dependent Claim
124 words
A telephone system comprising: means for separating a telephone set from a telephone line and sending a holding tone to said telephone line in response to a holding operation of said telephone set, said telephone line being placed in a holding mode when said telephone set is separated from said telephone line; means connected to said telephone line in said holding mode for detecting a hold releasing signal from said telephone line; means for automatically releasing said holding mode in response to a detection output of said holding-releasing-signal detecting means; and means for generating a hold release enable signal together with said holding tone, and wherein said hold-releasing-signal detecting means is connected to said line only during generation of said hold release enable signal.
Claim 7
Dependent Claim
124 words
A telephone system comprising: means for separating a telephone set from a telephone line and sending a holding tone to said telephone line in response to a holding operation of said telephone set, said telephone line being placed in a holding mode when said telephone set is separated from said telephone line; means connected to said telephone line in said holding mode for detecting a hold releasing signal from said telephone line; means for automatically releasing said holding mode in response to a detection output of said holding-releasing-signal detecting means; and means for generating a hold release enable signal together with said holding tone, and wherein said hold-releasing-signal detecting means is connected to said line only during generation of said hold release enable signal.
Claim 8
Dependent Claim
157 words
A telephone system comprising: line interface means connected to a telephone line; telephone set interface means connected to a telephone set; time-division switch means connected to said line interface means and said telephone set interface means through a PCM highway for performing a digital time-division exchange between said telephone line and said telephone set; and control means connected to said telephone line interface means, said telephone set interface means and said time-division switch means through a data highway for controlling said line interface means, said telephone set interface means and said time-division switch means; and wherein said line interface means comprises: a speech reception circuit for receiving a speech signal from the line; and means connected to said speech reception circuit in a holding mode based on a holding operation of said telephone set; and wherein said control means comprises means for releasing said holding mode in response to a detection output of said hold-releasing-signal detecting means.
Claim 9
Dependent Claim
157 words
A telephone system comprising: line interface means connected to a telephone line; telephone set interface means connected to a telephone set; time-division switch means connected to said line interface means and said telephone set interface means through a PCM highway for performing a digital time-division exchange between said telephone line and said telephone set; and control means connected to said telephone line interface means, said telephone set interface means and said time-division switch means through a data highway for controlling said line interface means, said telephone set interface means and said time-division switch means; and wherein said line interface means comprises: a speech reception circuit for receiving a speech signal from the line; and means connected to said speech reception circuit in a holding mode based on a holding operation of said telephone set; and wherein said control means comprises means for releasing said holding mode in response to a detection output of said hold-releasing-signal detecting means.
Claim 10
Dependent Claim
27 words
A telephone system as set forth in claim 6, wherein said hold releasing signal is a DTMF signal and said hold-releasing-signal detecting means includes a DTMF receiver.
Claim 11
Dependent Claim
74 words
A telephone system as set forth in claim 6, wherein said hold-releasing-signal detecting means includes means for receiving said hold releasing signal; switch means turned on in response to a control signal from said control means in said holding mode to connect said hold-releasing-signal reception means to the speech reception circuit of said line interface means; and means for generating a detection output when receiving said hold releasing signal from said hold-releasing-signal receiving means.
Claim 12
Dependent Claim
77 words
A telephone system as set forth in claim 6. wherein said hold releasing means includes means for performing an exchange connection between said telephone set interface means associated with the telephone set subjected to the holding operation and said line interface means associated with said holding line under control of said time-division switch means, and means for turning on the talking circuit of the telephone set subjected to the holding operation through said telephone set interface means.
References Cited (Backward Citations)
JPS5612165A
Cited
US4425479A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-24 | 1993-01-23 | 1993-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-24 | 1997-01-23 | 1997-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-24 | 2001-01-23 | 2001-07-25 | $7700.00 | Window Closed / Lapsed |