US2431236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of sulphur from gaseous mixtures
Assignee: American Smelting and Refining Co
•
Filing: 1943-08-04
•
Granted: 1947-11-18
•
Expires: 1963-08-04
Abstract
No abstract record available.
Inventors
- 👤 Edward P Fleming
- 👤 Fitt T Cleon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:32
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/0473; C01B17/0478; Y; Y10; Y10S; Y10S55/00; Y10S55/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB109106A
Cited
US1444627A
Cited
GB416209A
Cited
US2063391A
Cited
US2143365A
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US2168150A
Cited
US2270427A
Cited
US2298641A
Cited
US2388259A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-11-17 | 1951-05-19 | 1951-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-11-17 | 1955-05-19 | 1955-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-11-17 | 1959-05-19 | 1959-11-18 | $7700.00 | Window Closed / Lapsed |