Patent US3670721A successfully refreshed from Google Patents.
US2414852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic process and apparatus
Assignee: Standard Oil Development Co
•
Filing: 1944-04-11
•
Granted: 1947-01-28
•
Expires: 1964-04-11
Abstract
No abstract record available.
Inventors
- 👤 Harvey E W Burnside
- 👤 Henry J Ogorzaly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:07
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/26; B01J8/28
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1950-01-27 | 1950-07-29 | 1951-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-01-27 | 1954-07-29 | 1955-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-01-27 | 1958-07-29 | 1959-01-28 | $7700.00 | Window Closed / Lapsed |