US3420939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arc furnace electrode structure
Assignee: Individual
•
Filing: 1968-01-04
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Granted: 1969-01-07
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Expires: 1988-01-04
Abstract
No abstract record available.
Inventors
- 👤 Max P Schlienger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:56
CPC Classifications
F; F27; F27B; F27B14/00; F27B14/06; C; C22; C22B; C22B4/00; F27D; F27D11/00; F27D11/08; H; H05; H05B; H05B7/00; H05B7/02; H05B7/06; H05B7/08; Y; Y10; Y10S; Y10S65/00; Y10S65/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |