US4326104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Current detector
Assignee: Tadiran Telecommunications Ltd
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Filing: 1979-07-25
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Granted: 1982-04-20
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Expires: 1999-07-25
Abstract
Abstract According to the present invention there is provided a current detector useful in interconnection of an automatic telephone exchange with a central office via TIP and RING leads and comprising; rectifying apparatus coupled to the TIP lead for rectifying at least a portion of the current flowing therealong of either polarity; and detector apparatus receiving the rectified output of the rectifying means and providing a DC output signal indicating current passage along the TIP lead.
Inventors
- 👤 Ephraim Bergida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:03
CPC Classifications
H; H04; H04M; H04M7/00; H04M7/0096
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
161 words
A current detector in an automatic telephone exchange interconnection circuit, useful in interconnection of an automatic telephone exchange with a central office via TIP and RING leads, for detecting any one of the loop current, ringing current and TIP lead ground current said current delector comprising: rectifying means coupled to the TIP lead for rectifying at least a portion of the current flowing therealong of either polarity; and detector means for receiving the rectified output of said rectifying means and for providing a DC output signal indicating current passage along the TIP lead; wherein said rectifying means produces a rectifier output, said detector means comprising an integrator for receiving and integrating said recitifier output to provide an integrated output, and a comparator for comparing said integrated output to a reference to produce said DC output signal indicating current passage along said TIP lead; whereby to detect any one of said loop current, said ringing current and said TIP lead ground current.
Claim 2
Dependent Claim
161 words
A current detector in an automatic telephone exchange interconnection circuit, useful in interconnection of an automatic telephone exchange with a central office via TIP and RING leads, for detecting any one of the loop current, ringing current and TIP lead ground current said current delector comprising: rectifying means coupled to the TIP lead for rectifying at least a portion of the current flowing therealong of either polarity; and detector means for receiving the rectified output of said rectifying means and for providing a DC output signal indicating current passage along the TIP lead; wherein said rectifying means produces a rectifier output, said detector means comprising an integrator for receiving and integrating said recitifier output to provide an integrated output, and a comparator for comparing said integrated output to a reference to produce said DC output signal indicating current passage along said TIP lead; whereby to detect any one of said loop current, said ringing current and said TIP lead ground current.
Claim 3
Dependent Claim
20 words
A current detector according to claim 9, further comprising limiting means for limiting the current passing through said rectifying means.
Claim 4
Dependent Claim
32 words
A current detector according to claim 2 wherein said limiting means comprises a plurality of diodes arranged in a pair of chains of opposite polarity connected in series with the TIP lead.
Claim 5
Dependent Claim
18 words
A current detector according to claim 1, wherein said rectifying means comprises a pair of back-to-back connected optocouplers.
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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) | 1985-04-19 | 1985-10-19 | 1986-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-19 | 1989-10-19 | 1990-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-19 | 1993-10-19 | 1994-04-20 | $7700.00 | Window Closed / Lapsed |