US2547011A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric fault alarm circuits
Assignee: International Standard Electric Corp
•
Filing: 1947-05-14
•
Granted: 1951-04-03
•
Expires: 1967-05-14
Abstract
No abstract record available.
Inventors
- 👤 Jacobsen Bent Bulow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:02
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/52; H03F1/54; H03F1/542
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1786805A
Cited
US1871457A
Cited
US2057531A
Cited
US2130440A
Cited
US2112228A
Cited
US2377506A
Cited
US2444421A
Cited
US2456499A
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 |