US3259892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-contained cable pressure indicating system
Assignee: AT&T Inc
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Filing: 1963-07-30
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Granted: 1966-07-05
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Expires: 1983-07-30
Abstract
No abstract record available.
Inventors
- 👤 William A Winckelmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:57
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/16; G01M3/18; G01M3/181; G01M3/26; G01M3/28; G01M3/2838; H; H04; H04M; H04M3/00; H04M3/22; H04M3/26; H04M3/28
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
150 words
AN IMPEDANCE TESTING CIRCUIT FOR DETERMINING THE VALUES OF IMPEDANCE ELEMENTS IN A PLURALITY OF RANGES COMPRISING A CONTROL CIRCUIT, A CONTROL RELAY FOR EACH OF SAID RANGES OPERATIVE IN RESPONSE TO SIGNALS FROM SAID CONTROL CIRCUIT, A POTENTIAL SOURCE FOR DEVELOPING A VOLTAGE DROP ACROSS SAID ELEMENTS, A FIRST DETECTING DEVICE ADAPTED TO BE ENERGIZED IF ONE OF SAID IMPEDANCE VALUES IN A FIRST GROUP OF SAID RANGES FALLS BELOW A PREDETERMINED MINIMUM FOR EACH OF SAID RANGES IN SAID FIRST GROUP, A SECOND DETECTING DEVICE ADAPTED TO BE ENERGIZED TO CAUSE SAID FIRST DETECTING DEVICE TO AMPLIFY SAID VOLTAGE OF SAID RANGES SAID IMPEDANCE VALUES IN A SECOND GROUP OF SAID RANGES RISES ABOVE A PREDETERMINED MAXIMUM FOR EACH OF SAID RANGES IN SAID SECOND GROUP, AND AN ALARM CIRCUIT RESPONSIVE TO THE ENERGIZATION OF SAID FIRST DETECTING DEVICE TO DELIVER AN ALARM SIGNAL TO SAID CONTROL CIRCUIT.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-07-04 | 1970-01-03 | 1970-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-04 | 1974-01-03 | 1974-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-04 | 1978-01-03 | 1978-07-05 | $7700.00 | Window Closed / Lapsed |