US3773986A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone line test isolation apparatus
Assignee: COMM SYSTEMS CORP
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Filing: 1971-12-13
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Granted: 1973-11-20
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Expires: 1991-12-13
Abstract
Abstract There is disclosed an apparatus, which is located at a subscriber equipment installation, for remotely disconnecting the subscriber equipment from the subscriber line and its associated central office equipment to facilitate testing of the central office equipment. The apparatus comprises a means for remotely applying a signal of preselected magnitude from the central office to the apparatus, a circuit responsive to the signal for opening the connection between the subscriber equipment and the subscriber line, thereby remotely isolating the subscriber equipment from the central office equipment, and a circuit for automatically reconnecting the subscriber equipment to the subscriber line after a preselected time interval.
Inventors
- 👤 H Tremblay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:46
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/22; H04M3/26; H04M3/28; H04M3/30; H04M3/301
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
132 words
An apparatus located at a subscriber equipment installation for remotely disconnecting the subscriber equipment from the subscriber line and its associated central office equipment comprising: means for remotely applying a first signal of preselected magnitude from said central office to said apparatus; normally closed switch means connected in said subscriber line between said subscriber equipment and said central office equipment; circuit means located between said switch means and said subscriber equipment for sensing the magnitude of said first signal, whereby said circuit means is adapted to open said normally closed switch means thereby disconnecting said subscriber equipment from said subscriber line, when said signal is of a preselected magnitude; and means for automatically closing said switch means after a preselected time interval thereby reconnecting said subscriber equipment to said central office equipment.
Claim 2
Independent Claim
132 words
An apparatus located at a subscriber equipment installation for remotely disconnecting the subscriber equipment from the subscriber line and its associated central office equipment comprising: means for remotely applying a first signal of preselected magnitude from said central office to said apparatus; normally closed switch means connected in said subscriber line between said subscriber equipment and said central office equipment; circuit means located between said switch means and said subscriber equipment for sensing the magnitude of said first signal, whereby said circuit means is adapted to open said normally closed switch means thereby disconnecting said subscriber equipment from said subscriber line, when said signal is of a preselected magnitude; and means for automatically closing said switch means after a preselected time interval thereby reconnecting said subscriber equipment to said central office equipment.
Claim 3
Dependent Claim
32 words
The apparatus of claim 1 wherein said circuit means further comprises a time delay means wherein said normally closed switch means is opened when said first signal has a preselected time duration.
Claim 4
Dependent Claim
37 words
The apparatus of claim 2 wherein said circuit means is adapted to open said normally closed switch means solely in response to said first signal of said preselected magnitude and is non-responsive to signals of other magnitudes.
Claim 5
Dependent Claim
137 words
The apparatus of claim 1 wherein said circuit means comprises: a first solid state switching means responsive to said first signal wherein said first solid state switching means generates a second signal when said first signal is of a preselected magnitude; a first pulsing circuit means responsive to said second signal wherein said first pulsing circuit means generates a first pulse signal when said first signal is of preselected magnitude and a preselected time duration; a second normally non-conductive solid state switching means responsive to said first pulse signal; and a relay winding means connected to said second solid state switching means wherein said first pulse signal causes said second solid state switch means to conduct thereby energizing said relay winding means and wherein said energized relay winding means causes said normally closed switch means to open.
Claim 6
Dependent Claim
27 words
The apparatus of claim 4 further comprising a second pulsing circuit wherein said second pulsing circuit causes said relay windings to de-energize after a preselected time interval.
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |