Patent US3539290A successfully refreshed from Google Patents.
US3539290A
Expired / Lapsed
US
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Recovery of metals from used hydrocarbon conversion catalysts
Assignee: Sinclair Research Inc
•
Filing: 1967-12-06
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Granted: 1970-11-10
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Expires: 1987-12-06
Abstract
No abstract record available.
Inventors
- 👤 Henry Erickson
- 👤 Robert L Foster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:55
CPC Classifications
C; C22; C22B; C22B23/00; C22B23/02; C22B23/026; C22B11/00; C22B11/02; C22B11/021; C22B11/04; C22B11/042; C22B34/00; C22B34/20; C22B34/22; C22B34/225; C22B34/30; C22B34/32; C22B34/325; C22B34/34; C22B34/345; C22B34/36; C22B34/365; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 0
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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) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |