Patent US2681401A successfully refreshed from Google Patents.
US2681401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arc welding apparatus
Assignee: Airco Inc
•
Filing: 1950-08-31
•
Granted: 1954-06-15
•
Expires: 1970-08-31
Abstract
No abstract record available.
Inventors
- 👤 Nelson E Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:40
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/16; B23K9/167
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1477538A
Cited
US1475189A
Cited
US1580020A
Cited
US1644237A
Cited
US1884714A
Cited
US1989691A
Cited
US2016043A
Cited
US1953915A
Cited
US2079956A
Cited
US2059089A
Cited
US2032260A
Cited
US2093881A
Cited
US2189399A
Cited
US2272158A
Cited
US2344775A
Cited
US2405446A
Cited
US2360160A
Cited
US2483897A
Cited
US2445607A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-14 | 1957-12-14 | 1958-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-14 | 1961-12-14 | 1962-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-14 | 1965-12-14 | 1966-06-15 | $7700.00 | Window Closed / Lapsed |