US3399992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making steel in a basic oxygen furnace utilizing preheated scrap metal
Assignee: Raymond Kaiser Engineers Inc
•
Filing: 1965-04-16
•
Granted: 1968-09-03
•
Expires: 1985-04-16
Abstract
No abstract record available.
Inventors
- 👤 Joseph J Ciochetto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:47
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/56; C21C5/562; C21C5/565; C21C5/28; C21C5/30; C21C5/32; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2804295A
Cited
US2805143A
Cited
US3022990A
Cited
US3231369A
Cited
US3301662A
Cited
US3223521A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-03 | 1972-03-04 | 1972-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-03 | 1976-03-04 | 1976-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-03 | 1980-03-04 | 1980-09-03 | $7700.00 | Window Closed / Lapsed |