US2764668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for electric arc welding in a protective atmosphere
Assignee: Air Liquide SA
•
Filing: 1953-01-09
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Granted: 1956-09-25
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Expires: 1973-01-09
Abstract
No abstract record available.
Inventors
- 👤 Dumoulin Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:46
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/06; B23K9/067; B23K9/0672; B23K9/0678
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1091479A
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US1979944A
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US2173450A
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US2401722A
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US2472323A
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US2473928A
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US2536294A
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US2599281A
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US2655586A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-25 | 1960-03-26 | 1960-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-25 | 1964-03-26 | 1964-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-25 | 1968-03-26 | 1968-09-25 | $7700.00 | Window Closed / Lapsed |