US3434947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the separation of iron from metal sulphate solutions and a hydrometallurgic process for the production of zinc
Assignee: Norske Zinkkompani AS
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Filing: 1965-12-29
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Granted: 1969-03-25
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Expires: 1985-12-29
Abstract
No abstract record available.
Inventors
- 👤 Georg Steintveit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:36
CPC Classifications
C; C22; C22B; C22B17/00; C22B17/04; C01; C01G; C01G1/00; C01G1/10; C01G9/00; C01G9/06; C22B19/00; C22B19/20; C22B19/26; C22B3/00; C22B3/04; C22B3/06; C22B3/08; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134; Y02P10/20
Claims Analysis
Total Claims: 0
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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) | 1972-03-24 | 1972-09-23 | 1973-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-24 | 1976-09-23 | 1977-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-24 | 1980-09-23 | 1981-03-25 | $7700.00 | Window Closed / Lapsed |