Patent US3535786A successfully refreshed from Google Patents.
Patent US2525862A successfully refreshed from Google Patents.
US2525862A
Expired / Lapsed
US
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Electrical resistance butt welding apparatus
Assignee: Babcock and Wilcox Co
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Filing: 1948-06-15
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Granted: 1950-10-17
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Expires: 1968-06-15
Abstract
No abstract record available.
Inventors
- 👤 Otis R Carpenter
- 👤 Jr George J Hartnett
- 👤 Reidar P C Rasmusen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:25
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/04; B23K11/043
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) | 1953-10-16 | 1954-04-17 | 1954-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-16 | 1958-04-17 | 1958-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-16 | 1962-04-17 | 1962-10-17 | $7700.00 | Window Closed / Lapsed |