Patent US2973428A successfully refreshed from Google Patents.
US2973428A
Expired / Lapsed
US
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Arc welding of unalloyed structural steel workpieces such as hull-plates, and arc welding electrodes therefor
Assignee: ESAB AB
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Filing: 1958-12-01
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Granted: 1961-02-28
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Expires: 1978-12-01
Abstract
No abstract record available.
Inventors
- 👤 Pfeiffer Claes Fredrik Hakan
- 👤 Valanti Veikko Olavi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:33
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/36; B23K35/365; B23K35/24; B23K35/30; B23K35/3053; C; C25; C25D; C25D3/00; C25D3/02; C25D3/46
Claims Analysis
Total Claims: 0
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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) | 1964-02-28 | 1964-08-29 | 1965-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-28 | 1968-08-29 | 1969-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-28 | 1972-08-29 | 1973-02-28 | $7700.00 | Window Closed / Lapsed |