US2456326A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of supported aluminum chloride catalysts
Assignee: Standard Oil Development Co
•
Filing: 1944-05-20
•
Granted: 1948-12-14
•
Expires: 1964-05-20
Abstract
No abstract record available.
Inventors
- 👤 Walter H Rupp
- 👤 Clarke T Harding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:48
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/06; C; C07; C07C; C07C5/00; C07C5/22; C07C5/27; C07C5/2767; C07C5/277; C07C5/2778; C07C5/2786; C07C5/2789
Claims Analysis
Total Claims: 0
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US2423845A
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US2388932A
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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) | 1951-12-14 | 1952-06-14 | 1952-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-14 | 1956-06-14 | 1956-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-14 | 1960-06-14 | 1960-12-14 | $7700.00 | Window Closed / Lapsed |