Patent US3421570A successfully refreshed from Google Patents.
US3421570A
Expired / Lapsed
US
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Aluminothermic welding process
Assignee: Goldschmidt ETB GmbH
•
Filing: 1967-02-20
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Granted: 1969-01-14
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Expires: 1987-02-20
Abstract
No abstract record available.
Inventors
- 👤 Hans Guntermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:59
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/02; B; B23; B23K; B23K35/00; B23K35/22; B23K35/34
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |