Patent US4841559A successfully refreshed from Google Patents.
US4841559A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone network interface tester
Assignee: TRITECH LABORATORIES Inc
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Filing: 1988-04-29
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Granted: 1989-06-20
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Expires: 2008-04-29
Abstract
Abstract A device for interposing in a telephone service line for testing the service line and a telephone network attached to the service line. Included is a first circuit for testing the service line, a second circuit for testing the telephone network, a third circuit for providing a normal connected between the service line and the telephone network, a fourth circuit for generating a reset signal on the service line, and a fifth circuit for testing an individual handset. Connectors are provided for connecting the device in circuit between a telephone service line and a telephone network. A multiposition switch is included for switching between the first through fifth circuits.
Inventors
- 👤 Guy T. Curtis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:04
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/22; H04M3/26; H04M3/28; H04M3/30; H04M3/301; H04M1/00; H04M1/24
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
115 words
A device for interposing in a multiple conductor telephone service line for testing the service line and a telephone network attached to the service line comprising: a. connector means for connecting the device in circuit between the telephone service line and the telephone network, b. first circuit means for testing said service line, including an amplifier for amplifying electrical signals on said service line and a transducer connected to said amplifier to produce an audible representation of said amplified electrical signals, c. second circuit means for testing said telephone network, including indicator means for identifying a plurality of conditions of said telephone network, and d. means for switching between said first and second circuit means.
Claim 2
Independent Claim
115 words
A device for interposing in a multiple conductor telephone service line for testing the service line and a telephone network attached to the service line comprising: a. connector means for connecting the device in circuit between the telephone service line and the telephone network, b. first circuit means for testing said service line, including an amplifier for amplifying electrical signals on said service line and a transducer connected to said amplifier to produce an audible representation of said amplified electrical signals, c. second circuit means for testing said telephone network, including indicator means for identifying a plurality of conditions of said telephone network, and d. means for switching between said first and second circuit means.
Claim 3
Dependent Claim
25 words
A device according to claim 1 in which said first circuit means includes means for generating a dial tone request signal on said service line.
Claim 4
Dependent Claim
27 words
A device according to claim 1 in which said amplifier is a two stage amplifier and including coupling capacitor means between the two stages of said amplifier.
Claim 5
Dependent Claim
44 words
A device according to claim 1 in which said service line comprises first and second conductors, and in which said indicator means comprises a first visible indicator connected in series with one of said conductors and a second visible indicator connected between said conductors.
Claim 6
Dependent Claim
16 words
A device according to claim 4 including a resistor in series with said second visible indicator.
Claim 7
Dependent Claim
15 words
A device according to claim 4 in which said visible indicators comprise light emitting diodes.
Claim 8
Dependent Claim
17 words
A device according to claim 4 including a zener diode in parallel with said second visible indicator.
Claim 9
Dependent Claim
38 words
A device according to claim 1 including third circuit means for providing a normal connection between said service line and said telephone network, said switching means including means for switching between said first, second and third circuit means.
Claim 10
Dependent Claim
25 words
A device according to claim 8 in which said service line comprises first and second conductors, and including a visible indicator connected between said conductors.
Claim 11
Dependent Claim
26 words
A device according to claim 9 in which said visible indicator comprises a light emitting diode, and including a resistor connected in series with said diode.
Claim 12
Dependent Claim
34 words
A device according to claim 1 including fourth circuit means for generating a reset signal on said service line, said switching means including means for switching between said first, second and fourth circuit means.
Claim 13
Dependent Claim
28 words
A device according to claim 11 in which said service line comprises first and second conductors, and said fourth circuit means comprises an open circuit between said conductors.
Claim 14
Dependent Claim
30 words
A device according to claim 1 including fifth circuit means for testing a telephone handset, said switching means including means for switching between said first, second and fifth circuit means.
Claim 15
Dependent Claim
25 words
A device according to claim 13 in which said fifth circuit means includes means connecting said first circuit means in parallel with a telephone handset.
Claim 16
Dependent Claim
15 words
A device according to claim 1 in which said switching means comprises a rotary switch.
Claim 17
Dependent Claim
16 words
A device according to claim 15 in which said rotary switch is double pole, multi position.
Claim 18
Independent Claim
126 words
A device for interposing in a multiple conductor telephone service line for testing the service line and a telephone network attached to the service line, comprising a. connector means for connecting the device in circuit between the telephone service line and the telephone network, b. first circuit means for testing said service line, c. second circuit means for testing said telephone network, including indicator means for identifying a plurality of conditions of said telephone network, d. third circuit means for providing a normal connection between said service line and said telephone network, e. fourth circuit means for generating a reset signal on said service line, f. fifth circuit means for testing a telephone handset, and g. means for switching between said first through fifth circuit means.
Claim 19
Independent Claim
126 words
A device for interposing in a multiple conductor telephone service line for testing the service line and a telephone network attached to the service line, comprising a. connector means for connecting the device in circuit between the telephone service line and the telephone network, b. first circuit means for testing said service line, c. second circuit means for testing said telephone network, including indicator means for identifying a plurality of conditions of said telephone network, d. third circuit means for providing a normal connection between said service line and said telephone network, e. fourth circuit means for generating a reset signal on said service line, f. fifth circuit means for testing a telephone handset, and g. means for switching between said first through fifth circuit means.
Claim 20
Dependent Claim
43 words
A device according to claim 17 in which service line comprises first and second conductors, and in which said indicator means comprises a first visible indicator connected in series with one of said conductors and a second visible indicator connected between said conductors.
Claim 21
Dependent Claim
25 words
A device according to claim 17 in which said service line comprises first and second conductors, and including a visible indicator connected between said conductors.
Claim 22
Dependent Claim
25 words
A device according to claim 17 in which said fifth circuit means includes means connecting said first circuit means in parallel with a telephone handset.
References Cited (Backward Citations)
US4513176A
Cited
US4581494A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-19 | 1992-12-19 | 1993-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-19 | 1996-12-19 | 1997-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-19 | 2000-12-19 | 2001-06-20 | $7700.00 | Window Closed / Lapsed |