US3218498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical spark producing apparatus
Assignee: SOUTH AFRICAN COUNCIL FOR SCIENTIFIC AND INDUSTRIAL RESEARCH
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Filing: 1962-05-14
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Granted: 1965-11-16
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Expires: 1982-05-14
Abstract
No abstract record available.
Inventors
- 👤 Wolfgang W Schroeder
- 👤 Strasheim Albertus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:47
CPC Classifications
H; H01; H01T; H01T7/00; G; G01; G01N; G01N21/00; G01N21/62; G01N21/66; G01N21/67
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
APPARATUS FOR PRODUCING AN ELECTRICAL SPARK IN A SPARK GAP BETWEEN TWO OPPOSED ELONGATED ELECTRODES ARRANGED WITH THEIR LONGITUDINAL AXES IN ALIGNMENT, IN WHICH AT LEAST SIX NEEDLE SHAPED MEMBERS OF ELECTRICALLY CONDUCTING MATERIAL ARE ARRANGED SO THAT THEIR POINTS ARE DIRECTED TOWARDS THE SPARK GAP BETWEEN THE ELECTRODES AND SO THAT THEIR POINTS LIE AT EQUAL INTERVALS ON THE CIRCUMFERENCE OF A CIRCLE AROUND THE COMMON AXIS OF THE ELECTRODES AND IN A PLANE AT RIGHT ANGLES TO SUCH AXIS THE DIAMETER AND POSITION OF THE CIRCLE BEING SUCH THAT THE SAID POINTS ARE IN CLOSE PROXIMITY TO THE SPARK GAP BUT SUFFICIENTLY SPACED THEREFROM SO AS TO BE FREE OF THE SPARK, ELECTRICAL CONNECTIONS FOR APPLYING A SPARKING VOLTAGE TO THE ELECTRODES, AND ELECTRICAL CONNECTIONS ADAPTED TO APPLY TO SUCH NEEDLE SHAPED MEMBERS A VOLTAGE AT LEAST EQUAL TO THAT APPLIED TO THE ELECTRODE OPERATING AT THE HIGHER VOLTAGE.
Claim 2
Dependent Claim
151 words
APPARATUS FOR PRODUCING AN ELECTRICAL SPARK IN A SPARK GAP BETWEEN TWO OPPOSED ELONGATED ELECTRODES ARRANGED WITH THEIR LONGITUDINAL AXES IN ALIGNMENT, IN WHICH AT LEAST SIX NEEDLE SHAPED MEMBERS OF ELECTRICALLY CONDUCTING MATERIAL ARE ARRANGED SO THAT THEIR POINTS ARE DIRECTED TOWARDS THE SPARK GAP BETWEEN THE ELECTRODES AND SO THAT THEIR POINTS LIE AT EQUAL INTERVALS ON THE CIRCUMFERENCE OF A CIRCLE AROUND THE COMMON AXIS OF THE ELECTRODES AND IN A PLANE AT RIGHT ANGLES TO SUCH AXIS THE DIAMETER AND POSITION OF THE CIRCLE BEING SUCH THAT THE SAID POINTS ARE IN CLOSE PROXIMITY TO THE SPARK GAP BUT SUFFICIENTLY SPACED THEREFROM SO AS TO BE FREE OF THE SPARK, ELECTRICAL CONNECTIONS FOR APPLYING A SPARKING VOLTAGE TO THE ELECTRODES, AND ELECTRICAL CONNECTIONS ADAPTED TO APPLY TO SUCH NEEDLE SHAPED MEMBERS A VOLTAGE AT LEAST EQUAL TO THAT APPLIED TO THE ELECTRODE OPERATING AT THE HIGHER VOLTAGE.
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) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |