US2431427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alumina base dehydrogenation catalyst
Assignee: Phillips Petroleum Co
•
Filing: 1943-06-21
•
Granted: 1947-11-25
•
Expires: 1963-06-21
Abstract
No abstract record available.
Inventors
- 👤 Walter A Schulze
- 👤 John C Hillyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:20
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/02; B01J23/04; Y; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/901; Y10S585/906
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1937381A
Cited
US2092449A
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US2118001A
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US2231446A
Cited
US2184235A
Cited
US2271751A
Cited
US2311979A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-11-24 | 1951-05-26 | 1951-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-11-24 | 1955-05-26 | 1955-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-11-24 | 1959-05-26 | 1959-11-25 | $7700.00 | Window Closed / Lapsed |