US2494847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety control for welders
Assignee: Cutler Hammer Inc
•
Filing: 1948-04-21
•
Granted: 1950-01-17
•
Expires: 1968-04-21
Abstract
No abstract record available.
Inventors
- 👤 Jerome B Welch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:19
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/30; B23K11/31
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE336825C
Cited
US1684296A
Cited
GB413664A
Cited
US2151342A
Cited
US2294388A
Cited
US2283996A
Cited
US2426280A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-16 | 1953-07-18 | 1954-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-16 | 1957-07-18 | 1958-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-16 | 1961-07-18 | 1962-01-17 | $7700.00 | Window Closed / Lapsed |