Patent US2547820A successfully refreshed from Google Patents.
US2547820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuse and igniter
Assignee: Individual
•
Filing: 1945-12-29
•
Granted: 1951-04-03
•
Expires: 1965-12-29
Abstract
No abstract record available.
Inventors
- 👤 Gustaf W Hammar
- 👤 George A Noddin
- 👤 Donald E Rosen
- 👤 Frank J Trelease
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:17
CPC Classifications
F; F42; F42C; F42C15/00; F42C15/20; F42C9/00; F42C9/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1307684A
Cited
US1815226A
Cited
US1999820A
Cited
US2000617A
Cited
US2079178A
Cited
US2075813A
Cited
US2139581A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-02 | 1954-10-02 | 1955-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-02 | 1958-10-02 | 1959-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-02 | 1962-10-02 | 1963-04-03 | $7700.00 | Window Closed / Lapsed |