US2990466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric arc working process and apparatus
Assignee: BOC Group Ltd
•
Filing: 1958-12-11
•
Granted: 1961-06-27
•
Expires: 1978-12-11
Abstract
No abstract record available.
Inventors
- 👤 Cresswell Robert Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:27
CPC Classifications
B; B23; B23K; B23K10/00; H; H05; H05H; H05H1/00; H05H1/24; H05H1/26; H05H1/32; H05H1/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2847555A
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US2963570A
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US2922869A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |