Patent US3376502A successfully refreshed from Google Patents.
US3376502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus having standard impedance calibration means for testing the impedance of an electrical ground and including polarity reversing switch means
Assignee: Individual
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Filing: 1965-06-18
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Granted: 1968-04-02
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Expires: 1985-06-18
Abstract
No abstract record available.
Inventors
- 👤 Frederick J Rink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:21
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/02; G01R27/16; G01R27/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
187 words
ELECTRICAL APPARATUS FOR TESTING THE IMPEDANCE OF A TEST ELECTRICAL GROUND COMPRISING AN A.C. POWER SUPPLY HAVING A GROUNDED NEUTRAL, TEST CIRCUIT MEANS CONNECTED TO SAID POWER SUPPLY INCLUDING, INDICATOR MEANS, AND MEANS TO APPLY CURRENT TO SAID TEST CIRCUIT MEANS CONNECTED IN A SERIES CIRCUIT ARRANGEMENT, A STANDARD RESISTOR CONNECTED ACROSS SAID SERIES CIRCUIT ARRANGEMENT, SAID MEANS TO APPLY CURRENT TO SAID TEST CIRCUIT MEANS POWERED BY CONNECTION TO SAID A.C. POWER SUPPLY AND SAID SERIES CIRCUIT ARRANGEMENT HAVING ONE SIDE CONNECTED TO SAID GROUNDED NEUTRAL AND THE OTHER SIDE CONNECTED TO THE TEST ELECTRICAL GROUND, SWITCHING MEANS TO COMPLETE THE CIRCUIT CONNECTION TO SAID STANDARD RESISTOR TO CALIBRATE SAID TEST CIRCUIT MEANS AND ALTERNATIVELY TO CONNECT SAID TEST ELECTRICAL GROUND TO SAID MEANS TO APPLY CURRENT AND SAID INDICATOR MEANS WHILE BREAKING THE CIRCUIT CONNECTION TO SAID STANDARD RESISTOR, AND ADDITIONAL POLARITY REVERSING SWITCHING MEANS CONNECTED ACROSS SAID POWER SUPPLY TO COMPLETE THE CONNECTION OF SAID GROUNDED NEUTRAL TO ONLY ONE SIDE OF SAID MEANS TO APPLY CURRENT REGARDLESS OF HOW SAID TEST CIRCUIT IS CONNECTED TO SAID GROUNDED NEUTRAL OF SAID A.C. POWER SUPPLY.
Claim 2
Dependent Claim
187 words
ELECTRICAL APPARATUS FOR TESTING THE IMPEDANCE OF A TEST ELECTRICAL GROUND COMPRISING AN A.C. POWER SUPPLY HAVING A GROUNDED NEUTRAL, TEST CIRCUIT MEANS CONNECTED TO SAID POWER SUPPLY INCLUDING, INDICATOR MEANS, AND MEANS TO APPLY CURRENT TO SAID TEST CIRCUIT MEANS CONNECTED IN A SERIES CIRCUIT ARRANGEMENT, A STANDARD RESISTOR CONNECTED ACROSS SAID SERIES CIRCUIT ARRANGEMENT, SAID MEANS TO APPLY CURRENT TO SAID TEST CIRCUIT MEANS POWERED BY CONNECTION TO SAID A.C. POWER SUPPLY AND SAID SERIES CIRCUIT ARRANGEMENT HAVING ONE SIDE CONNECTED TO SAID GROUNDED NEUTRAL AND THE OTHER SIDE CONNECTED TO THE TEST ELECTRICAL GROUND, SWITCHING MEANS TO COMPLETE THE CIRCUIT CONNECTION TO SAID STANDARD RESISTOR TO CALIBRATE SAID TEST CIRCUIT MEANS AND ALTERNATIVELY TO CONNECT SAID TEST ELECTRICAL GROUND TO SAID MEANS TO APPLY CURRENT AND SAID INDICATOR MEANS WHILE BREAKING THE CIRCUIT CONNECTION TO SAID STANDARD RESISTOR, AND ADDITIONAL POLARITY REVERSING SWITCHING MEANS CONNECTED ACROSS SAID POWER SUPPLY TO COMPLETE THE CONNECTION OF SAID GROUNDED NEUTRAL TO ONLY ONE SIDE OF SAID MEANS TO APPLY CURRENT REGARDLESS OF HOW SAID TEST CIRCUIT IS CONNECTED TO SAID GROUNDED NEUTRAL OF SAID A.C. POWER SUPPLY.
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) | 1971-04-02 | 1971-10-02 | 1972-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-02 | 1975-10-02 | 1976-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-02 | 1979-10-02 | 1980-04-02 | $7700.00 | Window Closed / Lapsed |