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Patent US2809278A successfully refreshed from Google Patents.
US2809278A
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Method and apparatus for magnetically-impelled arc welding
Assignee: Union Carbide Corp
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Filing: 1955-08-23
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Granted: 1957-10-08
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Expires: 1975-08-23
Abstract
No abstract record available.
Inventors
- 👤 John A Persson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:38
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/08; B23K9/06; B23K9/073; B23K9/0737
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US483425A
Cited
US1176614A
Cited
US1524714A
Cited
US1792243A
Cited
US1987691A
Cited
US2640135A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-07 | 1961-04-08 | 1961-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-07 | 1965-04-08 | 1965-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-07 | 1969-04-08 | 1969-10-08 | $7700.00 | Window Closed / Lapsed |