US2739932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrodepositing chromium on aluminum
Assignee: Individual
•
Filing: 1952-09-05
•
Granted: 1956-03-27
•
Expires: 1972-09-05
Abstract
No abstract record available.
Inventors
- 👤 Clarence W Forestek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:37
CPC Classifications
C; C25; C25D; C25D5/00; C25D5/34; C25D5/42; C25D5/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A METHOD OF ELECTRODEPOSITING CHROMIUM ON THE SURFACE OF AN ALUMINUM MEMBER; COMPRISING THE STEPS OF; CHEMICALLY REPLACING THE OXIDE FILM ON SAID SURFACE WITH A PROTECTIVE COATING OF ZINCATE TO PREVENT RE-OXIDATION UPON CONTACT WITH THE ATMOSPHERE; REMOVING SAID PROTECTIVE COATING AND SIMULTANEOUSLY PROVIDING AN ELECTRODEPOSIT OF CHROMIUM, ADHERED DIRECTLY TO SAID ALUMINUM SURFACE BY ELECTROLYSIS, OF SAID ALUMINUM MEMBER AT CONSTANT TEMPERATURE, IN A CONCENTRATED ELECTROLYTIC SOLUTION INCLUDING CHROMIC ACID AND SULFURIC ACID, SAID CONSTANT TEMPERATURE BEING BETWEEN 90* F. AND 120* F. SAID CHROMIC ACID BEING PRESENT IN CONCENTRATIONS RANGING FROM 40 TO 60 OUNCES PER GALLON OF SOLUTION; AND SAID SULFURIC ACID BEING PRESENT IN CONCENTRATIONS RANGING FROM 40 TO 60 OUNCES PER GALLON OF SOLUTION.
Claim 2
Independent Claim
120 words
A METHOD OF ELECTRODEPOSITING CHROMIUM ON THE SURFACE OF AN ALUMINUM MEMBER; COMPRISING THE STEPS OF; CHEMICALLY REPLACING THE OXIDE FILM ON SAID SURFACE WITH A PROTECTIVE COATING OF ZINCATE TO PREVENT RE-OXIDATION UPON CONTACT WITH THE ATMOSPHERE; REMOVING SAID PROTECTIVE COATING AND SIMULTANEOUSLY PROVIDING AN ELECTRODEPOSIT OF CHROMIUM, ADHERED DIRECTLY TO SAID ALUMINUM SURFACE BY ELECTROLYSIS, OF SAID ALUMINUM MEMBER AT CONSTANT TEMPERATURE, IN A CONCENTRATED ELECTROLYTIC SOLUTION INCLUDING CHROMIC ACID AND SULFURIC ACID, SAID CONSTANT TEMPERATURE BEING BETWEEN 90* F. AND 120* F. SAID CHROMIC ACID BEING PRESENT IN CONCENTRATIONS RANGING FROM 40 TO 60 OUNCES PER GALLON OF SOLUTION; AND SAID SULFURIC ACID BEING PRESENT IN CONCENTRATIONS RANGING FROM 40 TO 60 OUNCES PER GALLON OF SOLUTION.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-27 | 1959-09-26 | 1960-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-27 | 1963-09-26 | 1964-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-27 | 1967-09-26 | 1968-03-27 | $7700.00 | Window Closed / Lapsed |