US2773737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical process for recovering niobium values from niobiferous ferrophosphorus
Assignee: Monsanto Chemicals Ltd
•
Filing: 1953-11-24
•
Granted: 1956-12-11
•
Expires: 1973-11-24
Abstract
No abstract record available.
Inventors
- 👤 Morris L Nielsen
- 👤 Larry K Duncan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:47
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/20; C22B34/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A PROCESS FOR TREATING NIOBIFEROUS FERROPHOSPHORUS AND RECOVERY OF NIOBIUM VALUES THEREFROM, WHICH COMPRISES ROASTING SAID FERROPHOSPHORUS IN AIR, MIXING THE ROASTED PRODUCT WITH SODA ASH, HEATING THE MIXTURE TO A TEMPERATURE ONLY SUFFICIENT TO SINTER THE MIXTURE, LEACHING THE SINTER WITH HOT WATER, FURTHER LEACHING THE RESIDUE WITH HYDROCHLORIC ACID TO REMOVE IRON THEREFROM, FUSING THE RESIDUE WITH SODIUM PYROSULFATE, EXTRACTING THE FUSED PRODUCT WITH HOT TARTARIC ACID, TREATING THE RESULTING NIOBIUM-TARTRATE COMPLEX WITH HOT CONCENTRATED HYDROCHLORIC ACID AND RECOVERING NIOBIUM VALUES THEREFROM.
Claim 2
Dependent Claim
84 words
A PROCESS FOR TREATING NIOBIFEROUS FERROPHOSPHORUS AND RECOVERY OF NIOBIUM VALUES THEREFROM, WHICH COMPRISES ROASTING SAID FERROPHOSPHORUS IN AIR, MIXING THE ROASTED PRODUCT WITH SODA ASH, HEATING THE MIXTURE TO A TEMPERATURE ONLY SUFFICIENT TO SINTER THE MIXTURE, LEACHING THE SINTER WITH HOT WATER, FURTHER LEACHING THE RESIDUE WITH HYDROCHLORIC ACID TO REMOVE IRON THEREFROM, FUSING THE RESIDUE WITH SODIUM PYROSULFATE, EXTRACTING THE FUSED PRODUCT WITH HOT TARTARIC ACID, TREATING THE RESULTING NIOBIUM-TARTRATE COMPLEX WITH HOT CONCENTRATED HYDROCHLORIC ACID AND RECOVERING NIOBIUM VALUES THEREFROM.
References Cited (Backward Citations)
US2259396A
Cited
US2654655A
Cited
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 |