US2420542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carrying out chemical reactions in the presence of finely-divided solids
Assignee: Standard Oil Development Co
•
Filing: 1942-12-24
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Granted: 1947-05-13
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Expires: 1962-12-24
Abstract
No abstract record available.
Inventors
- 👤 Charles E Jahnig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:56
CPC Classifications
C; C01; C01B; C01B3/00; C01B3/02; C01B3/22; C01B3/24; C01B3/28; B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/26; C01B3/32; C01B3/34; C01B3/38; C01B3/40
Claims Analysis
Total Claims: 0
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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) | 1950-05-12 | 1950-11-11 | 1951-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-12 | 1954-11-11 | 1955-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-12 | 1958-11-11 | 1959-05-13 | $7700.00 | Window Closed / Lapsed |