US3229199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interference-free apparatus having a pair of rejection filters connected to hollow electrodes for testing insulated electrical conductors
Assignee: Dow Chemical Co
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Filing: 1961-10-18
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Granted: 1966-01-11
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Expires: 1981-10-18
Abstract
No abstract record available.
Inventors
- 👤 Raymond C Mildner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:38
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/50; G01R31/58; G01R31/59
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
177 words
AN APPARATUS FOR THE CONTINUOUS TESTING OF INSULATED CONDUCTORS HAVING A CONDUCTOR DISPOSED WITHIN AN INSULATING LAYER, THE APPARATUS COMPRISING A PAIR OF HOLLOW ELECTRODES ADAPTED TO PASS THE INSULATED CONDUCTOR TO BE TESTED, A PAIR OF REJECTION FILTERS, EACH FILTER HAVING AN INPUT TERMINAL AND OUTPUT TERMINAL, THE REJECTION FILTERS TUNED TO REJECT A FREQUENCY F, EACH OF THE OUTPUT TERMINALS OF THE REJECTION FILTERS BEING CONNECTED TO ONE OF THE HOLLOW ELECTRODES, THE INPUT TERMINALS OF THE REJECTION FILTERS BEING CONNECTED TOGETHER TO FORM A COMMON JUNCTION, MEANS TO APPLY AN ALTERNATING VOLTAGE OF SUFFICIENT MAGNITUDE TO CAUSE INTERNAL DISCHARGE TO OCCUR IN AT LEAST SOME VOIDS IN THE INSULATING LAYER, THE ALTERNATING VOLTAGE BEING APPLIED TO THE COMMON JUNCTION OF THE REJECTION FILTERS, THE ALTERNATING VOLTAGE HAVING A FREQUENCY OTHER THAN THE FREQUENCY F, GENERALLY CYLINDRICAL GROUNDED SHIELDS DISPOSED ON EITHER SIDE AND COAXIAL WITH THE PAIR OF HOLLOW ELECTRODES, A DETECTOR COUPLED TO THE HOLLOW ELECTRODES THE DETECTOR COMPRISING A TUNED AMPLIFIER AND INDICATING MEANS, THE DETECTOR BEING TUNED TO THE FREQUENCY F.
Claim 2
Independent Claim
177 words
AN APPARATUS FOR THE CONTINUOUS TESTING OF INSULATED CONDUCTORS HAVING A CONDUCTOR DISPOSED WITHIN AN INSULATING LAYER, THE APPARATUS COMPRISING A PAIR OF HOLLOW ELECTRODES ADAPTED TO PASS THE INSULATED CONDUCTOR TO BE TESTED, A PAIR OF REJECTION FILTERS, EACH FILTER HAVING AN INPUT TERMINAL AND OUTPUT TERMINAL, THE REJECTION FILTERS TUNED TO REJECT A FREQUENCY F, EACH OF THE OUTPUT TERMINALS OF THE REJECTION FILTERS BEING CONNECTED TO ONE OF THE HOLLOW ELECTRODES, THE INPUT TERMINALS OF THE REJECTION FILTERS BEING CONNECTED TOGETHER TO FORM A COMMON JUNCTION, MEANS TO APPLY AN ALTERNATING VOLTAGE OF SUFFICIENT MAGNITUDE TO CAUSE INTERNAL DISCHARGE TO OCCUR IN AT LEAST SOME VOIDS IN THE INSULATING LAYER, THE ALTERNATING VOLTAGE BEING APPLIED TO THE COMMON JUNCTION OF THE REJECTION FILTERS, THE ALTERNATING VOLTAGE HAVING A FREQUENCY OTHER THAN THE FREQUENCY F, GENERALLY CYLINDRICAL GROUNDED SHIELDS DISPOSED ON EITHER SIDE AND COAXIAL WITH THE PAIR OF HOLLOW ELECTRODES, A DETECTOR COUPLED TO THE HOLLOW ELECTRODES THE DETECTOR COMPRISING A TUNED AMPLIFIER AND INDICATING MEANS, THE DETECTOR BEING TUNED TO THE FREQUENCY F.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-10 | 1969-07-12 | 1970-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-10 | 1973-07-12 | 1974-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-10 | 1977-07-12 | 1978-01-11 | $7700.00 | Window Closed / Lapsed |