Patent US2872564A successfully refreshed from Google Patents.
US2872564A
Expired / Lapsed
US
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Welding apparatus
Assignee: Dupaco Inc
•
Filing: 1954-07-26
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Granted: 1959-02-03
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Expires: 1974-07-26
Abstract
No abstract record available.
Inventors
- 👤 Fresne Armand F Du
- 👤 Jr Franklin H Page
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:26
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/30; B23K11/31
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) | 1962-02-02 | 1962-08-04 | 1963-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-02 | 1966-08-04 | 1967-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-02 | 1970-08-04 | 1971-02-03 | $7700.00 | Window Closed / Lapsed |