US2943255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Charging circuit
Assignee: Dupaco Inc
•
Filing: 1956-12-06
•
Granted: 1960-06-28
•
Expires: 1976-12-06
Abstract
No abstract record available.
Inventors
- 👤 Fresne Armand F Du
- 👤 Jr Franklin H Page
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:22
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/24; B23K11/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2483691A
Cited
US2477946A
Cited
US2404971A
Cited
US2441822A
Cited
GB612242A
Cited
US2551407A
Cited
US2775731A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-28 | 1963-12-28 | 1964-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-28 | 1967-12-28 | 1968-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-28 | 1971-12-28 | 1972-06-28 | $7700.00 | Window Closed / Lapsed |