Patent US2882820A successfully refreshed from Google Patents.
US2882820A
Expired / Lapsed
US
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Electric blasting initiator
Assignee: Wyeth Holdings LLC
•
Filing: 1954-08-11
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Granted: 1959-04-21
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Expires: 1974-08-11
Abstract
No abstract record available.
Inventors
- 👤 Young Guy Bayard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:13
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/10; F42B3/103
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2240438A
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US2282106A
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GB543500A
Cited
GB552223A
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US2456653A
Cited
US2462070A
Cited
DE899965C
Cited
US2498644A
Cited
AT171646B
Cited
US2695563A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-20 | 1962-10-20 | 1963-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-20 | 1966-10-20 | 1967-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-20 | 1970-10-20 | 1971-04-21 | $7700.00 | Window Closed / Lapsed |