Patent US3591367A successfully refreshed from Google Patents.
US3591367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Additive agent for ferrous alloys
Assignee: Reading Alloys Inc
•
Filing: 1968-07-23
•
Granted: 1971-07-06
•
Expires: 1988-07-23
Abstract
Abstract METHOD OF PRODUCING VANADIUM AND COLUMBIUM ALLOY STEELS BY ADDING TO MOLTEN STEEL AN ADDITION AGENT CONTAINING AN OXIDE OF THE ALLOYING METAL, AN INORGANIC REDUCING AGENT, PARTICULARLY SILICON AND ALUMINUM, AND LIME. THE AMOUNT OF REDUCING AGENT EMPLOYED IS AT LEAST SUFFICIENT TO REDUCE THE OXIDE OF THE ALLOYING METAL TO THE CORRESPONDING METAL, AND THE AMOUNT OF LIME IS AT LEAST SUFFICIENT TO COMBINE WITH THE OXIDE OF THE REDUCING AGENT WHICH IS PRODUCED TO FORM A SLAG HAVING A MELTING POINT BELOW 1800*C.
Inventors
- 👤 Frederick H Perfect
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:51
CPC Classifications
C; C22; C22C; C22C33/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |