Patent US770570A successfully refreshed from Google Patents.
Patent US2490179A successfully refreshed from Google Patents.
US2490179A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of electric arc welding
Assignee: Hartford National Bank and Trust Co
•
Filing: 1947-04-29
•
Granted: 1949-12-06
•
Expires: 1967-04-29
Abstract
No abstract record available.
Inventors
- 👤 Willigen Paul Christiaan V Der
- 👤 Boon Simon Dirk
- 👤 Holierhock Johannes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:26
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/36; B23K35/3601; B23K35/3608; B23K35/3602; B23K35/3612
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1952-12-05 | 1953-06-06 | 1953-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-05 | 1957-06-06 | 1957-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-05 | 1961-06-06 | 1961-12-06 | $7700.00 | Window Closed / Lapsed |