US3339028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangements for detecting ground conditions on telephone lines
Assignee: Automatic Electric Laboratories Inc
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Filing: 1964-08-28
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Granted: 1967-08-29
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Expires: 1984-08-28
Abstract
No abstract record available.
Inventors
- 👤 Jack W Taugner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:28
CPC Classifications
H; H04; H04M; H04M15/00; H04M15/08; H04M3/00; H04M3/22; H04M3/26; H04M3/28; H04M3/30; H04Q; H04Q5/00; H04Q5/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
IN A TELEPHONE SYSTEM, A TWO-CONDUCTOR SUBSCRIBER LINE, ONE OR MORE SUBSTATIONS CONNECTED TO SAID LINE, CENTRAL OFFICE EQUIPMENT CONNECTED TO SAID LINE, A CENTRAL BATTERY HAVING A LIVE TERMINAL AND A GROUNDED TERMINAL, IMPULSE CONTACTS AT SAID SUBSTATION FOR OPENING AND CLOSING A LOOP CIRCUIT OVER SAID LINE TO SAID CENTRAL BATTERY BY WAY OF SAID CENTRAL OFFICE EQUIPMENT, SAID EQUIPMENT INCLUDING: FIRST MEANS COMPRISING A FAST-ACTING LINE RELAY FOR DETECTING CLOSED AND OPEN CONDITIONS OF SAID LOOP CIRCUIT, SECOND MEANS COMPRISING A POLARIZED RELAY FOR DETECTING GROUND CONDITIONS ON SAID LINE, AND MEANS FOR INCREASING THE SENSITIVITY OF SAID POLARIZED RELAY WHILE TESTING SAID LINE FOR SAID GROUND CONDITIONS.
Claim 2
Dependent Claim
111 words
IN A TELEPHONE SYSTEM, A TWO-CONDUCTOR SUBSCRIBER LINE, ONE OR MORE SUBSTATIONS CONNECTED TO SAID LINE, CENTRAL OFFICE EQUIPMENT CONNECTED TO SAID LINE, A CENTRAL BATTERY HAVING A LIVE TERMINAL AND A GROUNDED TERMINAL, IMPULSE CONTACTS AT SAID SUBSTATION FOR OPENING AND CLOSING A LOOP CIRCUIT OVER SAID LINE TO SAID CENTRAL BATTERY BY WAY OF SAID CENTRAL OFFICE EQUIPMENT, SAID EQUIPMENT INCLUDING: FIRST MEANS COMPRISING A FAST-ACTING LINE RELAY FOR DETECTING CLOSED AND OPEN CONDITIONS OF SAID LOOP CIRCUIT, SECOND MEANS COMPRISING A POLARIZED RELAY FOR DETECTING GROUND CONDITIONS ON SAID LINE, AND MEANS FOR INCREASING THE SENSITIVITY OF SAID POLARIZED RELAY WHILE TESTING SAID LINE FOR SAID GROUND CONDITIONS.
References Cited (Backward Citations)
US2785228A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-08-28 | 1971-02-27 | 1971-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-28 | 1975-02-27 | 1975-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-28 | 1979-02-27 | 1979-08-29 | $7700.00 | Window Closed / Lapsed |