Patent US3761635A successfully refreshed from Google Patents.
US3761635A
Expired / Lapsed
US
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Trunk circuit identification
Assignee: AG Communication Systems Corp
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Filing: 1972-05-15
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Granted: 1973-09-25
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Expires: 1992-05-15
Abstract
Abstract A technique for tracing calls involving two trunk circuits located in the same telephone switching center. Means are provided whereby an unknown outgoing trunk connected to a known incoming trunk may be identified, or an unknown incoming trunk connected to a known outgoing trunk may be identified.
Inventors
- 👤 J Gibson
- 👤 S Fuchs
- 👤 R Vaniman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:10
CPC Classifications
H; H04; H04Q; H04Q3/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
261 words
A telephone switching center including a plurality of trunks, a switching matrix operated to selectively establish circuit connections between selected trunks, a testing facility, and means for identifying a trunk of unknown identity connected through said matrix to a trunk of known identity, said identification means comprising: detection means included in each of said trunks each comprised of a differentially wound relay; a plurality of individual access means included in said test facility, each associated with a different one of said trunks and each including a circuit con-nection to said detection means in said associated trunk; a plurality of individual signaling means included in said test facility each associated with a different one of said trunks and each including a circuit connection to said detection means in said associated trunk; said plurality of trunks including a trunk of known identity connected through said switching matrix to a trunk of unknown identity; said connection including a circuit connection between said de-tection means included in said known identity trunk and said de-tection means included in said unknown identity truNk; operating means included in said test facility selectively con-nected to said access means associated with said trunk of known identity; said detection means included in said trunk of known identity operated continuously and said connected de-tection means in said unknown identity trunk operated periodically in response to said connected operating means, said signaling means associated with said unknown identity trunk periodically operated in response to said periodic operation of said detect-tion means included in said trunk of unknown identity, to identify said unknown trunk.
Claim 2
Dependent Claim
261 words
A telephone switching center including a plurality of trunks, a switching matrix operated to selectively establish circuit connections between selected trunks, a testing facility, and means for identifying a trunk of unknown identity connected through said matrix to a trunk of known identity, said identification means comprising: detection means included in each of said trunks each comprised of a differentially wound relay; a plurality of individual access means included in said test facility, each associated with a different one of said trunks and each including a circuit con-nection to said detection means in said associated trunk; a plurality of individual signaling means included in said test facility each associated with a different one of said trunks and each including a circuit connection to said detection means in said associated trunk; said plurality of trunks including a trunk of known identity connected through said switching matrix to a trunk of unknown identity; said connection including a circuit connection between said de-tection means included in said known identity trunk and said de-tection means included in said unknown identity truNk; operating means included in said test facility selectively con-nected to said access means associated with said trunk of known identity; said detection means included in said trunk of known identity operated continuously and said connected de-tection means in said unknown identity trunk operated periodically in response to said connected operating means, said signaling means associated with said unknown identity trunk periodically operated in response to said periodic operation of said detect-tion means included in said trunk of unknown identity, to identify said unknown trunk.
Claim 3
Dependent Claim
24 words
A telephone switching center as claimed in claim 1 wherein; each of said access means each comprises a jack connected to said associated trunk.
Claim 4
Dependent Claim
24 words
A telephone switching center as claimed in claim 1 wherein: each of said signaling means each comprises a lamp connected to said associated trunk.
Claim 5
Dependent Claim
22 words
A telephone switching center as claimed in claim 1 wherein: each of said operating means each comprises a source of pulsating potential.
Claim 6
Dependent Claim
61 words
A telephone switching center as claimed in claim 1 wherein: each of said differen-tially wound relays includes a first winding connected between said associated access means and said switch-ing matrix, a second winding polarized opposite said first wind-ing, connected between said access means and a source of operat-ing potential, and a pair of switching contacts connected to said associated signaling means.
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |