US2592580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing iron oxide from ferrous chloride
Assignee: Nitralloy Corp
•
Filing: 1945-02-09
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Granted: 1952-04-15
•
Expires: 1965-02-09
Abstract
No abstract record available.
Inventors
- 👤 Loevenstein Hirsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:54
CPC Classifications
C; C01; C01G; C01G49/00; C01G49/02; C01G49/06; Y; Y10; Y10S; Y10S423/00; Y10S423/01
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
95 words
THE PROCESS OF PREPARING FINELY DIVIDED FERRIC OXIDE WHICH COMPRISES EVAPORATING A FERROUS CHLORIDE SOLUTION UNTIL ALL WATER IS REMOVED EXCEPT WATER OF CRYSTALLIZATION, THEREAFTER DEHYDRATING THE RESULTING FERROUS CHLORIDE POLYHDRATE SALT UNTIL ALL WATER EXCEPT ONE MOL OF WATER OF CRYSTALLIZATION IS REMOVED THEREFROM, THEN HEATING THE FERROUS CHLORIDE MONOHYDRATE SO PRODUCED IN AIR AND IN THE ABSENCE OF WATER VAPOR AT A TEMPERATURE WITHIN THE RANGE 45*-300* C. TO PRODUCE THEREFROM FERRIC OXIDE AND DRY HYDROCHLORIC ACID GAS, AND RECOVERING THE IRON OXIDE AND THE HCL, THE LATTER BEING OBTAINED IN DRY FORM.
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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) | 1955-04-15 | 1955-10-15 | 1956-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-15 | 1959-10-15 | 1960-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-15 | 1963-10-15 | 1964-04-15 | $7700.00 | Window Closed / Lapsed |