Patent US5324944A successfully refreshed from Google Patents.
US3606293A
Expired / Lapsed
US
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Method and apparatus for purification of molten metal
Assignee: Individual
•
Filing: 1969-09-29
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Granted: 1971-09-20
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Expires: 1989-09-29
Abstract
Abstract THIS DISCLOSURE RELATES TO THE PURIFICATION OF METALS. IT MORE PARTICULARLY REFERS TO THE DEGASIFICATION OF METALS AND ESPECIALLY TO SUCH METAL DEGISIFICATION FROM METALS WHICH ARE MOLTEN.
Inventors
- 👤 Frank F Erdely
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:05
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/0081; C21C7/10
Claims Analysis
Total Claims: 0
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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) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |