Patent US2651023A successfully refreshed from Google Patents.
US2651023A
Expired / Lapsed
US
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Variable transformer for alternating current welders
Assignee: Commonwealth Engineering Company of Ohio
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Filing: 1951-05-15
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Granted: 1953-09-01
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Expires: 1971-05-15
Abstract
No abstract record available.
Inventors
- 👤 Francis B Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:43
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/06; B23K9/073; B23K9/0738
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1701774A
Cited
US1672703A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-31 | 1957-03-02 | 1957-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-31 | 1961-03-02 | 1961-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-31 | 1965-03-02 | 1965-09-01 | $7700.00 | Window Closed / Lapsed |