Patent US2271646A successfully refreshed from Google Patents.
US2271646A
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Control of contact catalytic reactions
Assignee: Universal Oil Products Co
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Filing: 1939-05-17
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Granted: 1942-02-03
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Expires: 1959-05-17
Abstract
No abstract record available.
Inventors
- 👤 Louis S Kassel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:02
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/02; B01J8/04; B01J8/0403; B01J8/0407; B01J8/0419; B01J8/0207; B01J8/0214; B01J8/0446; B01J8/0449; B01J8/0453; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00106; B01J2208/00265
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1945-02-02 | 1945-08-04 | 1946-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-02-02 | 1949-08-04 | 1950-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-02-02 | 1953-08-04 | 1954-02-03 | $7700.00 | Window Closed / Lapsed |