US2358509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtration and reclamation of cracking catalysts
Assignee: VICKERS PETROLEUM CO Inc
•
Filing: 1941-05-09
•
Granted: 1944-09-19
•
Expires: 1961-05-09
Abstract
No abstract record available.
Inventors
- 👤 Joel H Hirsch
- 👤 Frank L Herle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:35
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/02; B01J8/0207; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D35/00; B01D35/18; B01J38/00; B01J38/04; B01J38/12; B01D37/00
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) | 1947-09-19 | 1948-03-20 | 1948-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-09-19 | 1952-03-20 | 1952-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-09-19 | 1956-03-20 | 1956-09-19 | $7700.00 | Window Closed / Lapsed |