US2688535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metallurgical process
Assignee: Madaras Corp
•
Filing: 1949-11-07
•
Granted: 1954-09-07
•
Expires: 1969-11-07
Abstract
No abstract record available.
Inventors
- 👤 Julius D Madaras
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:14
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/0006; C22; C22B; C22B5/00; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
33 words
A METHOD OF REFINING METAL COMPRISING INTRODUCING CARBON, LIME, ALUMINA AND SILICA INTO A MOLTEN METAL BATH AND HOLDING SAID MATERIALS SUBMERGED IN SAID BATH UNTIL SAID MATERIALS ARE ABSORBED BY SAID BATH.
Claim 2
Independent Claim
33 words
A METHOD OF REFINING METAL COMPRISING INTRODUCING CARBON, LIME, ALUMINA AND SILICA INTO A MOLTEN METAL BATH AND HOLDING SAID MATERIALS SUBMERGED IN SAID BATH UNTIL SAID MATERIALS ARE ABSORBED BY SAID BATH.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-06 | 1958-03-08 | 1958-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-06 | 1962-03-08 | 1962-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-06 | 1966-03-08 | 1966-09-07 | $7700.00 | Window Closed / Lapsed |