Patent US2922023A successfully refreshed from Google Patents.
US2922023A
Expired / Lapsed
US
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Electric arc process and apparatus
Assignee: Union Carbide Corp
•
Filing: 1956-12-17
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Granted: 1960-01-19
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Expires: 1976-12-17
Abstract
No abstract record available.
Inventors
- 👤 Robert L Hackman
- 👤 Raymond P Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:01
CPC Classifications
H; H05; H05B; H05B7/00; H05B7/02; H05B7/11; B; B23; B23K; B23K9/00; B23K9/007; H01; H01J; H01J25/00; H01J25/50; H01J25/52
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1085769A
Cited
US1700319A
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US2281335A
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US2308510A
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US2360160A
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US2516016A
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US2583665A
Cited
US2721923A
Cited
US2703835A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |