Patent US2428873A successfully refreshed from Google Patents.
US2428873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for catalytic contacting
Assignee: Standard Oil Co
•
Filing: 1945-05-26
•
Granted: 1947-10-14
•
Expires: 1965-05-26
Abstract
No abstract record available.
Inventors
- 👤 Robert C Gunness
- 👤 John F Snuggs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:18
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)
US2347747A
Cited
US2347682A
Cited
US2341193A
Cited
US2367351A
Cited
US2304128A
Cited
US2363874A
Cited
US2412152A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-13 | 1951-04-14 | 1951-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-13 | 1955-04-14 | 1955-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-13 | 1959-04-14 | 1959-10-14 | $7700.00 | Window Closed / Lapsed |