Patent US4368363A successfully refreshed from Google Patents.
US4368363A
Expired / Lapsed
US
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Audible line test termination device
Assignee: TII Industries Inc
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Filing: 1981-05-11
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Granted: 1983-01-11
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Expires: 2001-05-11
Abstract
Abstract An audible test termination device for providing a characteristic signature to the telephone central office and an audible signal to the customer when a continuity test is made on a subscriber line having a pair of electrically conductive paths includes a miniature audio indicator and a minimum of associated electrical components to indicate to the central office test operator and the customer that the telephone subscriber line is in operating order. One embodiment of the instant invention may be utilized as an additional high impedance ringer for the customer. The present device may be permanently installed across the subscriber line.
Inventors
- 👤 Omprakash G. Ahuja
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:20
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/24; H04M3/00; H04M3/22; H04M3/26; H04M3/28; H04M3/30; H04M3/301; Y; Y10; Y10S; Y10S439/00; Y10S439/912
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
83 words
A line test termination device for providing a characteristic signature to the telephone central office and an audible signal at the subscriber termination when a continuity test is made on a subscriber line having a pair of electrically conductive paths, comprising; a series current path including a resistance means, a diode means, voltage breakover means and an audio indicator means connected in series, said diode means being poled opposite said voltage breakover means, said current path being connected across said electrically conducting paths.
Claim 2
Dependent Claim
83 words
A line test termination device for providing a characteristic signature to the telephone central office and an audible signal at the subscriber termination when a continuity test is made on a subscriber line having a pair of electrically conductive paths, comprising; a series current path including a resistance means, a diode means, voltage breakover means and an audio indicator means connected in series, said diode means being poled opposite said voltage breakover means, said current path being connected across said electrically conducting paths.
Claim 3
Dependent Claim
47 words
A line termination device according to claim 1 wherein said audio indicator means further includes a second voltage breakover means connected in parallel therewith to limit the voltage thereacross to its safe operating value when said telephone central office performs said continuity test on said subscriber line.
Claim 4
Dependent Claim
18 words
A line test termination device according to claim 1 wherein said voltage breakover means is a zener diode.
Claim 5
Dependent Claim
37 words
A line test termination device according to claim 1 further including a zener diode connected in parallel with said audio indicator means to limit the voltage thereacross, said zener diode being poled opposite to said diode means.
Claim 6
Dependent Claim
54 words
A line test termination device according to claims 1, 2, 3 or 4 wherein said resistance means has one end thereof connected to one of said electrically conductive paths and further including a capacitor, said capacitor being connected from the other end of said resistance means to said other of said electrically conductive paths.
Claim 7
Dependent Claim
104 words
A line test termination device according to claims 1, 2, 3 or 4 further including a housing, said housing including input and output connecting means for continuing said electrically conductive paths, said input connecting means being adapted to receive a mating connector means provided on a telephone instrument and continue said electrically conductive paths through said mating connector means, said output connecting means being adapted to be received by a wall receptacle having therein said electrically conductive paths extending to said telephone central office, said housing having said resistance means, said diode means, said voltage breakover means and said audio indicator means disposed therein.
Claim 8
Dependent Claim
84 words
A line test termination device according to claims 1, 2, 3 or 4 further including a housing, said housing including connecting means for continuing said electrically conductive paths from said telephone central office, said connecting means being adapted to receive a mating connector means provided on a telephone instrument and continue said electrically conductive paths through said mating connector means to said telephone instrument, said housing having said resistance means, said diode means, said voltage breakover means, and said audio indicator means disposed therein.
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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) | 1986-01-10 | 1986-07-12 | 1987-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-10 | 1990-07-12 | 1991-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-10 | 1994-07-12 | 1995-01-11 | $7700.00 | Window Closed / Lapsed |