US2487564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silica gel-alumina supported catalyst
Assignee: MW Kellogg Co
•
Filing: 1946-04-19
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Granted: 1949-11-08
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Expires: 1966-04-19
Abstract
No abstract record available.
Inventors
- 👤 Edwin T Layng
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:11
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/88; B01J23/881; B01J23/16; Y; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/906
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2216262A
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US2268109A
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US2243404A
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US2275441A
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US2343852A
Cited
US2317803A
Cited
US2395836A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-07 | 1953-05-09 | 1953-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-07 | 1957-05-09 | 1957-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-07 | 1961-05-09 | 1961-11-08 | $7700.00 | Window Closed / Lapsed |