Patent US3588688A successfully refreshed from Google Patents.
US3588688A
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Impedance checking apparatus for shielded electrical systems
Assignee: Westinghouse Electric Corp
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Filing: 1968-12-10
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Granted: 1971-06-28
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Expires: 1988-12-10
Abstract
Abstract ELECTRICAL CIRCUIT CHECKING APPARATUS FOR DETERMINING THE CONDITION OF AN ELECTRICAL LOAD CIRCUIT PRIOR TO CONNECTING AN ENERGIZED CONDUCTOR THERETO. THE CIRCUIT CHECKING APPARATUS CONNECTS A CURRENT LIMITING IMPEDANCE OF KNOWN MAGNITUDE BETWEEN THE ENERGIZED CONDUCTOR AND THE LOAD CIRCUIT TO BE CHECKED, AND PROVIDES AN INDICATION OF THE IMPEDANCE OF THE LOAD CIRCUIT RELATIVE TO THE MANGITUDE OF THE CURRENT LIMITING IMPEDNACE.
Inventors
- 👤 Arthur M Lockie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:33
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/50; G01R31/52
Claims Analysis
Total Claims: 0
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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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |