US2902455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing catalysts
Assignee: Wintershall Dea International AG
•
Filing: 1954-03-09
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Granted: 1959-09-01
•
Expires: 1974-03-09
Abstract
No abstract record available.
Inventors
- 👤 Fischer Karl
- 👤 Sydow Herbert
- 👤 Streckebach Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:37
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2733220A
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US2013670A
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US2092903A
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US2370200A
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US2450394A
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US2449664A
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US2490260A
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US2633454A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-31 | 1963-03-02 | 1963-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-31 | 1967-03-02 | 1967-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-31 | 1971-03-02 | 1971-09-01 | $7700.00 | Window Closed / Lapsed |