Patent US2928722A successfully refreshed from Google Patents.
US2928722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the fractional distillation of inorganic halides
Assignee: BASF Schweiz AG
•
Filing: 1957-08-09
•
Granted: 1960-03-15
•
Expires: 1977-08-09
Abstract
No abstract record available.
Inventors
- 👤 Scheller Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:19
CPC Classifications
C; C01; C01G; C01G1/00; C01G1/06; B; B01; B01D; B01D3/00; B01D3/14; C01B; C01B9/00; C01B9/02; C01G33/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
A PROCESS FOR THE DISTILLATION OF A METAL HALIDE MIXTURE CONTAINING NIOBIUM AND TANTALUM PENTACHLORIDE AND ALSO CONTAINING IRON, WHEREIN A ANHYDROUS ADDUCT THERMICALLJY STABLE UP TO 300* C. OF PHOSPHOROUS OXYCHLORIDE WITH ALUMINUM CHLORIDE IS ADDED TO THE MIXTURE, THE DISTILLATION IS CARRIED OUT UNDER ATMOSPHERIC PRESSURE AND NIOBIUM AND TANTALUM CHLORIDES ARE SEPARATELY COLLECTED.
Claim 2
Dependent Claim
56 words
A PROCESS FOR THE DISTILLATION OF A METAL HALIDE MIXTURE CONTAINING NIOBIUM AND TANTALUM PENTACHLORIDE AND ALSO CONTAINING IRON, WHEREIN A ANHYDROUS ADDUCT THERMICALLJY STABLE UP TO 300* C. OF PHOSPHOROUS OXYCHLORIDE WITH ALUMINUM CHLORIDE IS ADDED TO THE MIXTURE, THE DISTILLATION IS CARRIED OUT UNDER ATMOSPHERIC PRESSURE AND NIOBIUM AND TANTALUM CHLORIDES ARE SEPARATELY COLLECTED.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-15 | 1963-09-14 | 1964-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-15 | 1967-09-14 | 1968-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-15 | 1971-09-14 | 1972-03-15 | $7700.00 | Window Closed / Lapsed |