US4339708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Testing apparatus for dielectric breakdown caused by tracking phenomena
Assignee: Panasonic Holdings Corp
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Filing: 1980-02-19
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Granted: 1982-07-13
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Expires: 2000-02-19
Abstract
Abstract A pair of opposed electrodes is disposed on each of a plurality of electrically insulating specimens, and specified voltage is applied to each pair of electrodes. In this state, the specimens are brought to a position below a single dripping nozzle intermittently one after another to apply a drop of test solution to each specimen between the electrodes. The apparatus repeats this step cyclically.
Inventors
- 👤 Mitsuru Saito
- 👤 Yuji Karatani
- 👤 Wataru Sakurai
- 👤 Ken'ichi Nobuta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:59
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/12; G01R31/18; G01R31/1227; G01R31/1245
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
163 words
A testing apparatus for dielectric breakdown caused by tracking phenomena comprising: a dripping nozzle; a plurality of pairs of opposed electrodes each being adapted to be held in contact with one of a corresponding number of specimens to be tested; moving means for successively moving the pairs of electrodes together with the specimens relative to the nozzle repetitively at an overall time interval but intermittently at a constant smaller time interval in a manner such that each specimen is stopped for a specified period when it is in a position immediately below the nozzle; dripping control means for dripping a test solution from the nozzle to each specimen at a location between each pair of electrodes when the specimen is immediately below the nozzle; power supply means for supplying electric power to the plurality of pairs of electrodes; power control means for controlling power supply condition for the electrodes and on-off condition therefor; and means for detecting current through each pair of electrodes.
Claim 2
Dependent Claim
163 words
A testing apparatus for dielectric breakdown caused by tracking phenomena comprising: a dripping nozzle; a plurality of pairs of opposed electrodes each being adapted to be held in contact with one of a corresponding number of specimens to be tested; moving means for successively moving the pairs of electrodes together with the specimens relative to the nozzle repetitively at an overall time interval but intermittently at a constant smaller time interval in a manner such that each specimen is stopped for a specified period when it is in a position immediately below the nozzle; dripping control means for dripping a test solution from the nozzle to each specimen at a location between each pair of electrodes when the specimen is immediately below the nozzle; power supply means for supplying electric power to the plurality of pairs of electrodes; power control means for controlling power supply condition for the electrodes and on-off condition therefor; and means for detecting current through each pair of electrodes.
Claim 3
Dependent Claim
74 words
A testing apparatus as defined in claim 1 further comprising cam means coupled to the moving means and associated with each pair of electrodes for dividing said overall time interval into a plurality of time sections, interrupting means for cutting off the power supply by comparing the current detected by the detecting means during each time section, and a time meter for measuring the number of the overall time intervals and time sections elapsed.
Claim 4
Dependent Claim
28 words
A testing apparatus as defined in claim 1 wherein the dripping control means is brought out of operation in response to a detecting signal from the detecting means.
Claim 5
Dependent Claim
35 words
A testing apparatus as defined in claim 1 further comprising means for altering the distance between the pair of electrodes and the nozzle when the pair is brought to the position immediately below the nozzle.
Claim 6
Dependent Claim
25 words
A testing apparatus as defined in claim 1 wherein each of the electrodes is mounted on a sliding member slidably supported on a vertical rod.
Claim 7
Dependent Claim
30 words
A testing apparatus as defined in claim 1 wherein a movable blocking plate is positionable between the nozzle and the pair of electrodes in the position immediately below the nozzle.
Claim 8
Dependent Claim
43 words
A testing apparatus as defined in claim 1 further comprising means for lowering and raising the dripping nozzle relative to the specimens for the application of a drop of test solution from the lowered nozzle to each specimen when in said stopped position.
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) | 1985-07-12 | 1986-01-11 | 1986-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-12 | 1990-01-11 | 1990-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-12 | 1994-01-11 | 1994-07-13 | $7700.00 | Window Closed / Lapsed |