Patent US2929915A successfully refreshed from Google Patents.
US2929915A
Expired / Lapsed
US
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Welding transformer apparatus
Assignee: Kirkhof Manufacturing Corp
•
Filing: 1958-03-31
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Granted: 1960-03-22
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Expires: 1978-03-31
Abstract
No abstract record available.
Inventors
- 👤 Roy M Taylor
- 👤 Preston E Girton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:40
CPC Classifications
H; H01; H01F; H01F30/00; H01F30/06; H01F30/10; B; B23; B23K; B23K11/00; B23K11/30; B23K11/31
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1236090A
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US1779365A
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US1993961A
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US2295925A
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US2318023A
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US2318024A
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US2300700A
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US2242867A
Cited
US2443077A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-22 | 1963-09-21 | 1964-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-22 | 1967-09-21 | 1968-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-22 | 1971-09-21 | 1972-03-22 | $7700.00 | Window Closed / Lapsed |