Patent US3515541A successfully refreshed from Google Patents.
US3515541A
Expired / Lapsed
US
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Process for the recovery of noble metals
Assignee: Osterreichische Stickstoffwerke AG
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Filing: 1967-05-03
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Granted: 1970-06-02
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Expires: 1987-05-03
Abstract
No abstract record available.
Inventors
- 👤 Helmut Wimmer
- 👤 Anton Wagner
- 👤 Rudolf Staudigl
- 👤 Hermann Rudorfer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:36
CPC Classifications
C; C22; C22B; C22B11/00; C22B11/02; C22B11/021; C22B11/026; C22B11/028; Y; Y02; Y02P; Y02P10/00; 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) | 1973-06-01 | 1973-12-01 | 1974-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-01 | 1977-12-01 | 1978-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-01 | 1981-12-01 | 1982-06-02 | $7700.00 | Window Closed / Lapsed |