US2773743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of sulfuric acid and iron oxide from iron sulfate
Assignee: Individual
•
Filing: 1953-09-17
•
Granted: 1956-12-11
•
Expires: 1973-09-17
Abstract
No abstract record available.
Inventors
- 👤 Fackert Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:22
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/69; C01B17/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A PROCESS FOR THE RECOVERY OF SULFURIC ACID AND IRON OXIDE FROM FERROUS SULFATE, WHICH COMPRISES PASSING STEAM THROUGH THE FERROUS SULFATE AT A TEMPERATURE ABOVE 600* C. BUT NOT SUBSTANTIALLY IN EXCESS OF ABOUT 800* C. IN THE ABSENCE OF AIR AND IN THE PRESENCE OF AN OXIDIZING AGENT SELECTED FROM THE GROUP CONSISTING OF NITRIC ACID, BARIUM PEROXIDE AND POTASSIUM CHLORATE.
Claim 2
Dependent Claim
63 words
A PROCESS FOR THE RECOVERY OF SULFURIC ACID AND IRON OXIDE FROM FERROUS SULFATE, WHICH COMPRISES PASSING STEAM THROUGH THE FERROUS SULFATE AT A TEMPERATURE ABOVE 600* C. BUT NOT SUBSTANTIALLY IN EXCESS OF ABOUT 800* C. IN THE ABSENCE OF AIR AND IN THE PRESENCE OF AN OXIDIZING AGENT SELECTED FROM THE GROUP CONSISTING OF NITRIC ACID, BARIUM PEROXIDE AND POTASSIUM CHLORATE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-11 | 1960-06-11 | 1960-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-11 | 1964-06-11 | 1964-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-11 | 1968-06-11 | 1968-12-11 | $7700.00 | Window Closed / Lapsed |