US3418563A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single-phase transformer for electric arc welding
Assignee: Individual
•
Filing: 1966-03-09
•
Granted: 1968-12-24
•
Expires: 1986-03-09
Abstract
No abstract record available.
Inventors
- 👤 Grosu Stefan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:17
CPC Classifications
H; H01; H01F; H01F29/00; H01F29/02; B; B23; B23K; B23K9/00; B23K9/10; B23K9/1006; B23K9/1012
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-24 | 1972-06-24 | 1972-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-24 | 1976-06-24 | 1976-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-24 | 1980-06-24 | 1980-12-24 | $7700.00 | Window Closed / Lapsed |