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Patent US1640668A successfully refreshed from Google Patents.
US1640668A
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Process for the regeneration of metal catalysts contaminated by sulphur
Assignee: INT DES PROCEDES PRUDHOMME SOC
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Filing: 1926-05-08
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Granted: 1927-08-30
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Expires: 1946-05-08
Abstract
No abstract record available.
Inventors
- 👤 Prudhomme Eugene Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:34
CPC Classifications
C; C10; C10G; C10G11/00; B; B01; B01J; B01J23/00; B01J23/90; C10G11/10; Y; Y10; Y10S; Y10S502/00; Y10S502/515; Y10S502/517
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) | 1930-08-29 | 1931-02-28 | 1931-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-08-29 | 1935-02-28 | 1935-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-08-29 | 1939-02-28 | 1939-08-30 | $7700.00 | Window Closed / Lapsed |