Patent US1973300A successfully refreshed from Google Patents.
US4156711A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the removal of impurities contained in a zinc and cadmium sulfate solution
Assignee: Societe des Mines et Fonderies de Zinc de la Vieille Montagne SA
•
Filing: 1977-11-11
•
Granted: 1979-05-29
•
Expires: 1997-11-11
Abstract
Abstract Process for removing chlorine from an acidic zinc or cadmium sulphate solon, comprising adding thereto acid of Caro or an ammonium or alkali metal salt thereof.
Inventors
- 👤 Fernand J. J. Bodson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:05
CPC Classifications
C; C01; C01B; C01B7/00; C01B7/01; C01B7/03; C01G; C01G11/00; C01G9/00; C01G9/06; Y; Y10; Y10S; Y10S204/00; Y10S204/13
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
44 words
Process for removing chlorine anions from a sulphate solution of zinc or cadmium, having an acidity of at least 10 g sulphuric acid per liter, comprising adding to said solution a solution of H 2 SO 5 or an ammonium or alkali salt thereof.
Claim 2
Dependent Claim
44 words
Process for removing chlorine anions from a sulphate solution of zinc or cadmium, having an acidity of at least 10 g sulphuric acid per liter, comprising adding to said solution a solution of H 2 SO 5 or an ammonium or alkali salt thereof.
Claim 3
Dependent Claim
37 words
Process according to claim 1, wherein the solution of H 2 SO 5 is prepared by hydrolysing a solution of H 2 S 2 O 8 until its H 2 SO 5 content has reached a maximum.
Claim 4
Dependent Claim
33 words
Process according to claim 2, wherein the solution of H 2 S 2 O 8 has been hydrolysed during a time comprised between 10 and 14 hours at a temperature of 20° C.
Claim 5
Dependent Claim
20 words
Process according to claim 1, wherein the solution of H 2 SO 5 is prepared from oleum and hydrogen peroxide.
Claim 6
Dependent Claim
35 words
Process according to claim 1, wherein any manganese (IV) salts are reduced to manganese (II) salts by means of iron (II) sulphate, which is added before adding the solution of H 2 SO 5 .
References Cited (Backward Citations)
US570624A
Cited
US1310943A
Cited
US1066245A
Cited
US1444484A
Cited
US1879577A
Cited
GB370965A
Cited
US2145816A
Cited
US2746840A
Cited
US2977221A
Cited
US3215627A
Cited
US3393046A
Cited
GB1371302A
Cited
SU496237A1
Cited
US4005174A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-28 | 1982-11-27 | 1983-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-28 | 1986-11-27 | 1987-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-28 | 1990-11-27 | 1991-05-29 | $7700.00 | Window Closed / Lapsed |