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US2416744A
Expired / Lapsed
US
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Process for the utilization of ferrous sulphate solutions in the manufacture of other sulphates
Assignee: Individual
•
Filing: 1943-04-09
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Granted: 1947-03-04
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Expires: 1963-04-09
Abstract
No abstract record available.
Inventors
- 👤 Charles B Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:52
CPC Classifications
C; C01; C01G; C01G49/00; C01G49/02; C01G49/06; Y; Y10; Y10S; Y10S423/00; Y10S423/01; Y10S423/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE21215E
Cited
US708585A
Cited
US868385A
Cited
US1477965A
Cited
US1550521A
Cited
US1824936A
Cited
US2021936A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-03-03 | 1950-09-02 | 1951-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-03-03 | 1954-09-02 | 1955-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-03-03 | 1958-09-02 | 1959-03-04 | $7700.00 | Window Closed / Lapsed |