US2839382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of refining metals
Assignee: Huettenwerk Oberhausen AG
•
Filing: 1956-03-20
•
Granted: 1958-06-17
•
Expires: 1976-03-20
Abstract
No abstract record available.
Inventors
- 👤 Rudolf F Graef
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:10
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A METHOD OF REFINING METALS IN A CERAMIC-LINED DRUM ROTATABLE ABOUT A SUBSTANTIALLY HORIZONTAL AXIS, WHICH INCLUDES THE STEPS OF: INTRODUCING THE METAL BATH TO BE REFINED INTO SAID DRUM, ROTATING SAID DRUM ABOUT SAID HORIZONTAL AXIS AT A CIRCUMFERENTIAL VELOCITY OF THE INSIDE WALL OF SAID DRUM WITHIN A RANGE OF FROM 0.15 CENTIMETRE PER SECOND TO 30 CENTIMETRES PER SECOND, AND WHILE SAID DRUM IS BEING ROTATED INTRODUCING AN OXYGEN ENRICHED AIR BLAST INTO SAID BATH THROUGH NOZZLE MEANS IMMERSING BELOW THE UPPER SURFACE OF SAID BATH.
Claim 2
Independent Claim
89 words
A METHOD OF REFINING METALS IN A CERAMIC-LINED DRUM ROTATABLE ABOUT A SUBSTANTIALLY HORIZONTAL AXIS, WHICH INCLUDES THE STEPS OF: INTRODUCING THE METAL BATH TO BE REFINED INTO SAID DRUM, ROTATING SAID DRUM ABOUT SAID HORIZONTAL AXIS AT A CIRCUMFERENTIAL VELOCITY OF THE INSIDE WALL OF SAID DRUM WITHIN A RANGE OF FROM 0.15 CENTIMETRE PER SECOND TO 30 CENTIMETRES PER SECOND, AND WHILE SAID DRUM IS BEING ROTATED INTRODUCING AN OXYGEN ENRICHED AIR BLAST INTO SAID BATH THROUGH NOZZLE MEANS IMMERSING BELOW THE UPPER SURFACE OF SAID BATH.
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) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |