US2567207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Maintenance of catalytic activity in hydrocarbon conversion systems
Assignee: Houdry Process Corp
•
Filing: 1947-01-21
•
Granted: 1951-09-11
•
Expires: 1967-01-21
Abstract
No abstract record available.
Inventors
- 👤 Hoge Albert Wesley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:25
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/005; C; C10; C10G; C10G11/00; C10G11/14; C10G11/16
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) | 1954-09-10 | 1955-03-12 | 1955-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-10 | 1959-03-12 | 1959-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-10 | 1963-03-12 | 1963-09-11 | $7700.00 | Window Closed / Lapsed |