US2424205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of ammonium sulphate
Assignee: FUEL REFINING Corp
•
Filing: 1943-02-10
•
Granted: 1947-07-15
•
Expires: 1963-02-10
Abstract
No abstract record available.
Inventors
- 👤 Otto Carl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:25
CPC Classifications
C; C01; C01C; C01C1/00; C01C1/24; C01C1/242; Y; Y10; Y10S; Y10S159/00; Y10S159/13; Y10S159/901; Y10S159/902
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB191016193A
Cited
GB361935A
Cited
US1936308A
Cited
US1932674A
Cited
US1972730A
Cited
DE648540C
Cited
US2067043A
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US2055211A
Cited
DE639041C
Cited
GB507351A
Cited
US2249192A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-07-14 | 1951-01-13 | 1951-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-07-14 | 1955-01-13 | 1955-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-07-14 | 1959-01-13 | 1959-07-15 | $7700.00 | Window Closed / Lapsed |