US2956871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum dezincing of lead
Assignee: American Smelting and Refining Co
•
Filing: 1958-02-10
•
Granted: 1960-10-18
•
Expires: 1978-02-10
Abstract
No abstract record available.
Inventors
- 👤 Leonard T Curnow
- 👤 Paul S Randazzo
- 👤 Arnold J Skalak
- 👤 Jr Thomas N Bosiljevac
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:54
CPC Classifications
C; C22; C22B; C22B19/00; C22B19/04; C22B13/00; C22B13/06; C22B19/16; C22B9/00; C22B9/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
A PROCESS FOR REMOVING ZINC FROM LEAD WHICH COMPRISES ESTABLISHING A MOLTEN POOL OF LEAD CONTAINING ZINC, MAINTAINING THE MOLTEN POOL UNDER VACUUM WHILE CIRCULATING THE MOLTEN METAL THEREUNDER TO AND FROM THE POOL SURFACE BY IMPELLING THE METAL ON A PATH WHICH COMPRISES A RADICAL OUTWARD FLOW OF METAL IN ALL DIRECTIONS
Claim 2
Dependent Claim
53 words
A PROCESS FOR REMOVING ZINC FROM LEAD WHICH COMPRISES ESTABLISHING A MOLTEN POOL OF LEAD CONTAINING ZINC, MAINTAINING THE MOLTEN POOL UNDER VACUUM WHILE CIRCULATING THE MOLTEN METAL THEREUNDER TO AND FROM THE POOL SURFACE BY IMPELLING THE METAL ON A PATH WHICH COMPRISES A RADICAL OUTWARD FLOW OF METAL IN ALL DIRECTIONS
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) | 1963-10-18 | 1964-04-18 | 1964-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-18 | 1968-04-18 | 1968-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-18 | 1972-04-18 | 1972-10-18 | $7700.00 | Window Closed / Lapsed |