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US2006221A
Expired / Lapsed
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Regeneration of platinum catalysts
Assignee: Grasselli Chemical Co
•
Filing: 1933-06-22
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Granted: 1935-06-25
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Expires: 1953-06-22
Abstract
No abstract record available.
Inventors
- 👤 Earl S Ridler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:02
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/90; B01J23/96; Y; Y10; Y10S; Y10S252/00; Y10S252/18
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) | 1938-06-24 | 1938-12-24 | 1939-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-06-24 | 1942-12-24 | 1943-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-06-24 | 1946-12-24 | 1947-06-25 | $7700.00 | Window Closed / Lapsed |