US2600171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regeneration of chromic acid baths utilized in electrodeposition of chromium
Assignee: Individual
•
Filing: 1947-12-29
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Granted: 1952-06-10
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Expires: 1967-12-29
Abstract
No abstract record available.
Inventors
- 👤 Sagen Gunnar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:08
CPC Classifications
C; C25; C25C; C25C1/00; C25C1/06; C25C1/10; C01; C01G; C01G37/00; C01G37/02; C01G37/033; C25D; C25D21/00; C25D21/16; C25D21/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
METHOD OF PRODUCING CHROMIC ACID SOLUTIONS SUBSTANTIALLY FREE FROM TRIVALENT CHROMIUM AND IRON FROM CHROMIC ACID BATHS UTILIZED IN THE ELECTRO-DEPOSITION OF CHROMIUM COMPRISING THE TREATMENT OF THE BATH OF ELECTROLYSIS TO EFFECT OXIDATION OF TRIVALENT CHROMIUM TO HEXAVALENT, ADDING A NEUTRALIZING AGENT SELECTED FROM THE GROUP CONSISTING OF ALKALINE EARTH CARBONATES AND ALKALINE EARTH HYDROXIDES IN A QUANTITY SUFFICIENT FOR PRECIPITATING THE IRON OF THE SOLUTION PARTIALLY IN THE FORM OF FERRIC CHROMATE, CONVERTING THE CONTENTS OF HEXAVALENT CHROMIUM OF THE PRECIPITATE THEREBY FROMED INTO CHROMIC ACID
Claim 2
Dependent Claim
88 words
METHOD OF PRODUCING CHROMIC ACID SOLUTIONS SUBSTANTIALLY FREE FROM TRIVALENT CHROMIUM AND IRON FROM CHROMIC ACID BATHS UTILIZED IN THE ELECTRO-DEPOSITION OF CHROMIUM COMPRISING THE TREATMENT OF THE BATH OF ELECTROLYSIS TO EFFECT OXIDATION OF TRIVALENT CHROMIUM TO HEXAVALENT, ADDING A NEUTRALIZING AGENT SELECTED FROM THE GROUP CONSISTING OF ALKALINE EARTH CARBONATES AND ALKALINE EARTH HYDROXIDES IN A QUANTITY SUFFICIENT FOR PRECIPITATING THE IRON OF THE SOLUTION PARTIALLY IN THE FORM OF FERRIC CHROMATE, CONVERTING THE CONTENTS OF HEXAVALENT CHROMIUM OF THE PRECIPITATE THEREBY FROMED INTO CHROMIC ACID
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) | 1955-06-10 | 1955-12-10 | 1956-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-10 | 1959-12-10 | 1960-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-10 | 1963-12-10 | 1964-06-10 | $7700.00 | Window Closed / Lapsed |