Patent US2449253A successfully refreshed from Google Patents.
US2449253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of hollow gel spheroids
Assignee: ExxonMobil Oil Corp
•
Filing: 1945-06-23
•
Granted: 1948-09-14
•
Expires: 1965-06-23
Abstract
No abstract record available.
Inventors
- 👤 Edmund L Sargent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:03
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/02; B01J2/06; B01J2/08; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/03
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1755496A
Cited
US1682675A
Cited
US2093454A
Cited
US2102849A
Cited
US2340194A
Cited
US2384945A
Cited
US2388944A
Cited
US2384946A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-09-14 | 1952-03-15 | 1952-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-14 | 1956-03-15 | 1956-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-14 | 1960-03-15 | 1960-09-14 | $7700.00 | Window Closed / Lapsed |