US2537034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of commercial soda ash
Assignee: Individual
•
Filing: 1949-01-19
•
Granted: 1951-01-09
•
Expires: 1969-01-19
Abstract
No abstract record available.
Inventors
- 👤 Ruth E Churchward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:57
CPC Classifications
C; C01; C01D; C01D7/00; C01D7/22; C01D7/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A PROCESS FOR THE PRODUCTION OF PURIFIED SODA ASH WHICH COMPRISES TREATING A CONCENTRATED SOLUTION OF COMMERCIAL SODA ASH CONTAINING IMPURITIES WHICH FORM INSOLUBLE SULFIDE, REMOVING THE EXCESS OF SOLUBLE INORGANIC SULFIDE, REMOVING THE FORMED INSOLUBLE SULFIDE PRECIPITATE, THEN REMOVING RESIDUAL SOLUBLE INORGANIC SULFIDE BY TREATMENT WITH AT LEAST A CHEMICALLY EQUIVALENT QUANTITY OF COLBALT SULFATE, REMOVING THE FORMED COBALT SULFIDE PRECIPITATE, TREATING THE SOLUTION WITH FERRIC SULFATE TO FORM INSOLUBLE FERRIC HYDROXIDE CONTAINING PEPTIZED SULFIDES, THEN RECOVERING THE THUS-PURIFIED SOLUTION OF SODA ASH FROM THE IMPURITY-CONTAINING FERRIC HYDROXIDE RESIDUE.
Claim 2
Dependent Claim
90 words
A PROCESS FOR THE PRODUCTION OF PURIFIED SODA ASH WHICH COMPRISES TREATING A CONCENTRATED SOLUTION OF COMMERCIAL SODA ASH CONTAINING IMPURITIES WHICH FORM INSOLUBLE SULFIDE, REMOVING THE EXCESS OF SOLUBLE INORGANIC SULFIDE, REMOVING THE FORMED INSOLUBLE SULFIDE PRECIPITATE, THEN REMOVING RESIDUAL SOLUBLE INORGANIC SULFIDE BY TREATMENT WITH AT LEAST A CHEMICALLY EQUIVALENT QUANTITY OF COLBALT SULFATE, REMOVING THE FORMED COBALT SULFIDE PRECIPITATE, TREATING THE SOLUTION WITH FERRIC SULFATE TO FORM INSOLUBLE FERRIC HYDROXIDE CONTAINING PEPTIZED SULFIDES, THEN RECOVERING THE THUS-PURIFIED SOLUTION OF SODA ASH FROM THE IMPURITY-CONTAINING FERRIC HYDROXIDE RESIDUE.
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) | 1954-01-08 | 1954-07-10 | 1955-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-08 | 1958-07-10 | 1959-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-08 | 1962-07-10 | 1963-01-09 | $7700.00 | Window Closed / Lapsed |