US2453585A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making a substantially alkali-free hydrogel catalyst
Assignee: ExxonMobil Oil Corp
•
Filing: 1945-08-24
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Granted: 1948-11-09
•
Expires: 1965-08-24
Abstract
No abstract record available.
Inventors
- 👤 John W Payne
- 👤 Thomas P Simpson
- 👤 James I Butzner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:29
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1939647A
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US2410111A
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US2278746A
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US2364949A
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US2384505A
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US2406614A
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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) | 1951-11-09 | 1952-05-10 | 1952-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-09 | 1956-05-10 | 1956-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-09 | 1960-05-10 | 1960-11-09 | $7700.00 | Window Closed / Lapsed |