Patent US2931889A successfully refreshed from Google Patents.
US2931889A
Expired / Lapsed
US
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Apparatus for arc welding
Assignee: Individual
•
Filing: 1956-01-25
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Granted: 1960-04-05
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Expires: 1976-01-25
Abstract
No abstract record available.
Inventors
- 👤 John W Lingafelter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:49
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/08; B23K9/06; B23K9/073; B23K9/0737
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US501825A
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US510777A
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US515652A
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US1300117A
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US1302440A
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US1906496A
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US2028780A
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US2743342A
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US2809277A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |