Patent US3439408A successfully refreshed from Google Patents.
US3439408A
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US
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Process for initiating explosive and charge therefor
Assignee: EIDP Inc
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Filing: 1967-06-29
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Granted: 1969-04-22
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Expires: 1987-06-29
Abstract
No abstract record available.
Inventors
- 👤 Oswald R Bergmann
- 👤 Joseph Buchwald
- 👤 George R Cowan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:18
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/06; B23K20/08; B23K20/085; F; F42; F42B; F42B1/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3090306A
Cited
US3120827A
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US3140539A
Cited
US3281930A
Cited
US3280743A
Cited
US3364561A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-21 | 1972-10-21 | 1973-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-21 | 1976-10-21 | 1977-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-21 | 1980-10-21 | 1981-04-22 | $7700.00 | Window Closed / Lapsed |