Patent US2708877A successfully refreshed from Google Patents.
US2708877A
Expired / Lapsed
US
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Low tension igniter for explosives
Assignee: Smitsvonk NV
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Filing: 1948-06-23
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Granted: 1955-05-24
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Expires: 1968-06-23
Abstract
No abstract record available.
Inventors
- 👤 Smits Wijtze Beye
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:58
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/10; F42B3/14; F42B3/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A LOW TENSION IGNITER FOR EXPLOSIVES AND FOR OPERATION BY DISCHARGE OF AN ELECTRICAL CONDENSER, SAID IGNITER COMPRISING TWO CONCENTRIC ELECTRODES AND A SOLID CYLINDRICALLY SHAPED INSULATOR POSITIONED BETWEEN SAID CONCENTRIC ELECTRODES AND CONNECTING THEM MECHANICALLY AND HAVING ONE SURFACE FLUSH WITH THE SPARK GENERATING ENDS OF SAID ELECTRODES TO PROVIDE A SUPPORTED SPARK GAP, THE FLUSH SURFACE OF SIAD INSULATOR BEING FORMED AS A SEMICONDUCTIVE LAYER PROVIDING A CONTINUOUS SPARK SUPPORTING SURFACE POSITIONED BETWEEN SAID ELECTRODES.
Claim 2
Dependent Claim
77 words
A LOW TENSION IGNITER FOR EXPLOSIVES AND FOR OPERATION BY DISCHARGE OF AN ELECTRICAL CONDENSER, SAID IGNITER COMPRISING TWO CONCENTRIC ELECTRODES AND A SOLID CYLINDRICALLY SHAPED INSULATOR POSITIONED BETWEEN SAID CONCENTRIC ELECTRODES AND CONNECTING THEM MECHANICALLY AND HAVING ONE SURFACE FLUSH WITH THE SPARK GENERATING ENDS OF SAID ELECTRODES TO PROVIDE A SUPPORTED SPARK GAP, THE FLUSH SURFACE OF SIAD INSULATOR BEING FORMED AS A SEMICONDUCTIVE LAYER PROVIDING A CONTINUOUS SPARK SUPPORTING SURFACE POSITIONED BETWEEN SAID ELECTRODES.
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) | 1958-05-23 | 1958-11-22 | 1959-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-23 | 1962-11-22 | 1963-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-23 | 1966-11-22 | 1967-05-24 | $7700.00 | Window Closed / Lapsed |