US3353262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of electric ignitors for detonators
Assignee: Davey Bickford Smith et Cie SA
•
Filing: 1964-04-24
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Granted: 1967-11-21
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Expires: 1984-04-24
Abstract
No abstract record available.
Inventors
- 👤 Ingold Alain
- 👤 Raynal Jean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:50
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/10; F42B3/103; F42B3/195; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49107
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
156 words
A PROCESS FOR THE PREPARATION OF ELECTRICAL IGNITORS FOR DETONATORS COMPRISING FORMING AN ADHERENT ELECTRICALLY CONDUCTIVE METALLIC COATING ON BOTH FACES OF A THIN STRIP OF DIELECTRIC MATERIAL, PROVIDING AT LEAST ONE SIDE EDGE OF SAID DIELECTRIC STRIP FREE FROM ANY METALLIZATION, WINDING AROUND THE COATED STRIP AND OVER SAID AT LEAST ONE EDGE A THIN AND NARROW METALLIC CONDUCTOR IN THE FORM OF A HELIX OF UNIFORM PITCH DEPOSITING A SECOND CONDUCTIVE METALLIC COATING OVER A MAJOR PORTION OF THE WIDTH OF BOTH FACES OF SAID STRIP INCLUDING PARTS OF THE HELICALLY WOUND CONDUCTOR WHILE PREVENTING THE METALLIZING OF SAID AT LEAST ONE SIDE EDGE, CUTTING SLOTS OUT OF SAID STRIP BETWEEN THE TURNS OF SAID HELIX ALONG THE AT LEAST ONE EDGE OF THE STRIP TO PROVIDE OUTWARDLY PROJECTING PORTIONS OF THE STRIP HAVING THE APPEARANCE OF THE TEETH OF A COMB, AND THEREAFTER CUTTING OFF SAID OUTWARDLY PROJECTING PORTIONS TO PROVIDE INDIVIDUAL IGNITORS.
Claim 2
Dependent Claim
156 words
A PROCESS FOR THE PREPARATION OF ELECTRICAL IGNITORS FOR DETONATORS COMPRISING FORMING AN ADHERENT ELECTRICALLY CONDUCTIVE METALLIC COATING ON BOTH FACES OF A THIN STRIP OF DIELECTRIC MATERIAL, PROVIDING AT LEAST ONE SIDE EDGE OF SAID DIELECTRIC STRIP FREE FROM ANY METALLIZATION, WINDING AROUND THE COATED STRIP AND OVER SAID AT LEAST ONE EDGE A THIN AND NARROW METALLIC CONDUCTOR IN THE FORM OF A HELIX OF UNIFORM PITCH DEPOSITING A SECOND CONDUCTIVE METALLIC COATING OVER A MAJOR PORTION OF THE WIDTH OF BOTH FACES OF SAID STRIP INCLUDING PARTS OF THE HELICALLY WOUND CONDUCTOR WHILE PREVENTING THE METALLIZING OF SAID AT LEAST ONE SIDE EDGE, CUTTING SLOTS OUT OF SAID STRIP BETWEEN THE TURNS OF SAID HELIX ALONG THE AT LEAST ONE EDGE OF THE STRIP TO PROVIDE OUTWARDLY PROJECTING PORTIONS OF THE STRIP HAVING THE APPEARANCE OF THE TEETH OF A COMB, AND THEREAFTER CUTTING OFF SAID OUTWARDLY PROJECTING PORTIONS TO PROVIDE INDIVIDUAL IGNITORS.
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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) | 1970-11-20 | 1971-05-22 | 1971-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-20 | 1975-05-22 | 1975-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-20 | 1979-05-22 | 1979-11-21 | $7700.00 | Window Closed / Lapsed |