Patent US2789253A successfully refreshed from Google Patents.
US2789253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protection of circuit breakers and metallic switches for carrying large currents
Assignee: Individual
•
Filing: 1951-12-28
•
Granted: 1957-04-16
•
Expires: 1971-12-28
Abstract
No abstract record available.
Inventors
- 👤 Vang Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:22
CPC Classifications
H; H01; H01H; H01H9/00; H01H9/54; H01H9/541; H01H9/542
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1421170A
Cited
US1406234A
Cited
US1681196A
Cited
US1792340A
Cited
US2043822A
Cited
US2094361A
Cited
US2196820A
Cited
US2292174A
Cited
US2537383A
Cited
FR894223A
Cited
US2610231A
Cited
US2665396A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-15 | 1960-10-15 | 1961-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-15 | 1964-10-15 | 1965-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-15 | 1968-10-15 | 1969-04-16 | $7700.00 | Window Closed / Lapsed |