Patent US2212474A successfully refreshed from Google Patents.
US2212474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric blasting initiator
Assignee: EIDP Inc
•
Filing: 1937-12-24
•
Granted: 1940-08-20
•
Expires: 1957-12-24
Abstract
No abstract record available.
Inventors
- 👤 Charles R Johnson
- 👤 Roland R Nydegger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:17
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/10; F42B3/103
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-08-20 | 1944-02-19 | 1944-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-08-20 | 1948-02-19 | 1948-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-08-20 | 1952-02-19 | 1952-08-20 | $7700.00 | Window Closed / Lapsed |