US2435379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of spheroidal catalyst
Assignee: Shell Development Co
•
Filing: 1943-12-14
•
Granted: 1948-02-03
•
Expires: 1963-12-14
Abstract
No abstract record available.
Inventors
- 👤 Raymond C Archibald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:41
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/06; B01J21/08; B01J2/00; B01J2/02; B01J2/06; B01J2/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1806663A
Cited
US1297724A
Cited
US1508118A
Cited
US1614636A
Cited
US1755496A
Cited
US1949360A
Cited
US1843576A
Cited
US1900859A
Cited
US1985343A
Cited
US2088281A
Cited
US2085129A
Cited
US2282922A
Cited
US2283172A
Cited
US2302297A
Cited
US2299768A
Cited
US2289918A
Cited
US2215305A
Cited
US2258786A
Cited
US2284248A
Cited
US2272301A
Cited
US2384943A
Cited
US2387596A
Cited
US2418232A
Cited
US2384946A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-02-02 | 1951-08-04 | 1952-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-02-02 | 1955-08-04 | 1956-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-02-02 | 1959-08-04 | 1960-02-03 | $7700.00 | Window Closed / Lapsed |