Patent US3268867A successfully refreshed from Google Patents.
US3268867A
Expired / Lapsed
US
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Pressurized cable monitoring system having direct current interrogation of remote monitoring apparatus
Assignee: North Electric Co
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Filing: 1962-07-16
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Granted: 1966-08-23
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Expires: 1982-07-16
Abstract
No abstract record available.
Inventors
- 👤 Robert E Pickett
- 👤 Edward E Bauman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:16
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/26; G01M3/28; G01M3/2838; G01M3/04; G01M3/16; G01M3/18; G01M3/181
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
IN A MONITORING SYSTEM INCLUDING A CENTRAL OFFICE HAVING A DIRECT-CURRENT POWER SOURCE COMMON TO THE SYSTEM, A PLURALITY OF CABLES, EACH OF WHICH CABLES HAS A SEPARATE GROUP OF REMOTE MONITOR MEANS CONNECTED THERETO, EACH OF SAID REMOTE MONITOR MEANS INCLUDING A TONE GENERATOR MEANS OPERATIVE TO TRANSIMT A SIGNAL OVER ITS ASSOCIATED CABLE TO INDICATE AT LEAST ONE PREDETERMINED CONDITION AT THE POINT MONITORED THEREBY, SELECTOR MEANS AT SAID CENTRAL STATION FOR SELECTIVELY CONNECTING SAID DIRECT-CURRENT POWER SOURCE TO EACH CABLE INDEPENDENT OF THE OTHER CABLES TO ENERGIZE THE TONE GENERATOR MEANS CONNECTED THERETO, INDICATOR MEANS AT SAID CENTRAL OFFICE CONNECTED TO PROVIDE INDICATIONS OF SAID PREDETERMINED CONDITION AT EACH OF THE DIFFERENT REMOTE MONITOR UNITS
Claim 2
Dependent Claim
118 words
IN A MONITORING SYSTEM INCLUDING A CENTRAL OFFICE HAVING A DIRECT-CURRENT POWER SOURCE COMMON TO THE SYSTEM, A PLURALITY OF CABLES, EACH OF WHICH CABLES HAS A SEPARATE GROUP OF REMOTE MONITOR MEANS CONNECTED THERETO, EACH OF SAID REMOTE MONITOR MEANS INCLUDING A TONE GENERATOR MEANS OPERATIVE TO TRANSIMT A SIGNAL OVER ITS ASSOCIATED CABLE TO INDICATE AT LEAST ONE PREDETERMINED CONDITION AT THE POINT MONITORED THEREBY, SELECTOR MEANS AT SAID CENTRAL STATION FOR SELECTIVELY CONNECTING SAID DIRECT-CURRENT POWER SOURCE TO EACH CABLE INDEPENDENT OF THE OTHER CABLES TO ENERGIZE THE TONE GENERATOR MEANS CONNECTED THERETO, INDICATOR MEANS AT SAID CENTRAL OFFICE CONNECTED TO PROVIDE INDICATIONS OF SAID PREDETERMINED CONDITION AT EACH OF THE DIFFERENT REMOTE MONITOR UNITS
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) | 1969-08-22 | 1970-02-21 | 1970-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-22 | 1974-02-21 | 1974-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-22 | 1978-02-21 | 1978-08-23 | $7700.00 | Window Closed / Lapsed |