US2460811A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing pellfted ironoxide type catalysts
Assignee: Shell Development Co
•
Filing: 1944-08-26
•
Granted: 1949-02-08
•
Expires: 1964-08-26
Abstract
No abstract record available.
Inventors
- 👤 Elwyn P Davies
- 👤 Frank T Eggertsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:13
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/0009; Y; Y10; Y10S; Y10S425/00; Y10S425/101
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) | 1952-02-08 | 1952-08-09 | 1953-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-02-08 | 1956-08-09 | 1957-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-02-08 | 1960-08-09 | 1961-02-08 | $7700.00 | Window Closed / Lapsed |