US4644109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alarm information transmission system for coin telephone
Assignee: Tamura Electric Works Ltd
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Filing: 1985-10-07
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Granted: 1987-02-17
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Expires: 2005-10-07
Abstract
Abstract In a coin telephone, a self diagnosis function and an alarm information transmission function upon formation of a loop in an off-hook mode are utilized. Upon reception of a ringing signal from a maintenance control center, self diagnosis is performed. Upon detection of a failure, a content of the failure and a control number of the coin telephone are sent to the maintenance control center. A failure check for a coin telephone which is not frequently used can be performed from the telephone center without requiring an off-hook operation.
Inventors
- 👤 Yoshiaki Takeda
- 👤 Toshiharu Kinoshita
- 👤 Osamu Kai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:53
CPC Classifications
H; H04; H04M; H04M17/00; H04M17/02; H04M17/023
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
93 words
A coin telephone having a self diagnosis function, comprising: ringing detecting means, connected to station line terminals, for detecting a ringing signal; DC loop forming means for forming a DC loop upon detection of the ringing signal; self diagnosis means for starting a self diagnosis operation upon formation of the DC loop; and alarm transmission means for transmitting through said station line terminals alarm information corresponding to a content of a failure and a predetermined self control number assigned to said coin telephone when the failure is detected by the self diagnosis operation.
Claim 2
Dependent Claim
93 words
A coin telephone having a self diagnosis function, comprising: ringing detecting means, connected to station line terminals, for detecting a ringing signal; DC loop forming means for forming a DC loop upon detection of the ringing signal; self diagnosis means for starting a self diagnosis operation upon formation of the DC loop; and alarm transmission means for transmitting through said station line terminals alarm information corresponding to a content of a failure and a predetermined self control number assigned to said coin telephone when the failure is detected by the self diagnosis operation.
Claim 3
Dependent Claim
19 words
A telephone according to claim 1, wherein said self diagnosis means and said alarm transmission means constitute a microcomputer.
Claim 4
Dependent Claim
33 words
A telephone according to claim 1, wherein the alarm information and the self control number are stored in a memory in a predetermined order and are then transmitted through said station line terminals.
Claim 5
Dependent Claim
25 words
A telephone according to claim 3, wherein said memory comprises a dial output memory for sending a dial signal when an outgoing call is made.
Claim 6
Dependent Claim
29 words
A telephone according to claim 4, wherein contents of said dial output memory are sequentially sent through said station line terminals under the control of dial signal generating means.
Claim 7
Dependent Claim
41 words
A telephone according to claim 2, wherein said ringing detecting means has a memory for holding a ringing detection signal, and said microcomputer identifies an outgoing or incoming call in accordance with contents of said memory in said ringing detecting means.
Claim 8
Dependent Claim
39 words
A telephone according to claim 1, wherein said DC loop forming means has a function for disconnecting said DC loop after said alarm transmission means sends the alarm information and the self control number through said station line terminals.
Claim 9
Dependent Claim
29 words
A telephone according to claim 1, further comprising means for inhibiting telephone communication when said DC loop is formed or the failure is detected by the self diagnosis operation.
Claim 10
Dependent Claim
23 words
A telephone according to claim 1, wherein said DC loop forming means has means for forming said DC loop in an off-hook operation.
Claim 11
Dependent Claim
46 words
A telephone according to claim 1, wherein said ringing detecting means and said DC loop forming means are always applied with a bias voltage, and said self diagnosis means and said alarm transmission means are applied with the bias voltage after said DC loop is formed.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-16 | 1990-08-18 | 1991-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-16 | 1994-08-18 | 1995-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-16 | 1998-08-18 | 1999-02-17 | $7700.00 | Window Closed / Lapsed |