Patent US3459867A successfully refreshed from Google Patents.
US3459867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct arc furnace
Assignee: Airco Inc
•
Filing: 1967-08-10
•
Granted: 1969-08-05
•
Expires: 1987-08-10
Abstract
No abstract record available.
Inventors
- 👤 James W Estes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:42
CPC Classifications
F; F27; F27D; F27D11/00; C; C21; C21C; C21C5/00; C21C5/52; C21C5/5211; C21C5/5217; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y10; Y10S; Y10S65/00; Y10S65/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2268603A
Cited
US2649903A
Cited
US2679390A
Cited
US2803092A
Cited
US2976854A
Cited
US3193264A
Cited
US3136835A
Cited
US3197539A
Cited
US3234010A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-04 | 1973-02-03 | 1973-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-04 | 1977-02-03 | 1977-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-04 | 1981-02-03 | 1981-08-05 | $7700.00 | Window Closed / Lapsed |