Patent US2961358A successfully refreshed from Google Patents.
US2961358A
Expired / Lapsed
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Method of forming a chromate conversion coating on magnesium
Assignee: Henkel Corp
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Filing: 1957-03-08
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Granted: 1960-11-22
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Expires: 1977-03-08
Abstract
No abstract record available.
Inventors
- 👤 Ferdinand P Heller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:09
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
IN THE ART OF FORMING A CHEMICAL CONVERSION COATING ON MAGNESIUM SURFACES WHEREIN THE SURFACE IS SUBJECTED TO THE ACTION OF AN AQUEOUS ACID SOLUTION CONSISTING ESSENTIALLY OF HEXAVALENT CHROMIUM AND THE ANIONS OF MINERAL ACID FROM THE CLASS WHICH CONSISTS OF HYDROCHLORIC AND NITRIC ACIDS, THE METHOD WHICH INCLUDES THE FOLLOWING STEPS, PREPARING A BATH OF THE SAID SOLUTION WHICH CONTAINS, PER LITER, FROM 15 TO 25 GRAMS OF HEXAVALENT CHROMIUM FROM 20 TO 160 GRAMS OF CHLORIDE AND FROM 0.8 TO 1.5 GRAMS OF NITRATE EXPRESSED AS NANO3 FOR EACH GRAM OF CHLORIDE, HAETING THE BATH TO FROM 60* TO 100*F., APPLYING SAID BATH TO THE SURFACES TO BE COATED UNTIL A VISIBLE FILM IS PRODUCED THEREON, AND REPLENISHING THE BATH AS REQUIRED, DURING USE, SO AS TO MAINTAIN THE ACIDITY THEREOF WHICH IS TITRATABLE WITH CAUSTIC TO THE BROM CRESOL GREEN ENDPOINT, AT FROM 0.4 TO 1.0N.
Claim 2
Dependent Claim
150 words
IN THE ART OF FORMING A CHEMICAL CONVERSION COATING ON MAGNESIUM SURFACES WHEREIN THE SURFACE IS SUBJECTED TO THE ACTION OF AN AQUEOUS ACID SOLUTION CONSISTING ESSENTIALLY OF HEXAVALENT CHROMIUM AND THE ANIONS OF MINERAL ACID FROM THE CLASS WHICH CONSISTS OF HYDROCHLORIC AND NITRIC ACIDS, THE METHOD WHICH INCLUDES THE FOLLOWING STEPS, PREPARING A BATH OF THE SAID SOLUTION WHICH CONTAINS, PER LITER, FROM 15 TO 25 GRAMS OF HEXAVALENT CHROMIUM FROM 20 TO 160 GRAMS OF CHLORIDE AND FROM 0.8 TO 1.5 GRAMS OF NITRATE EXPRESSED AS NANO3 FOR EACH GRAM OF CHLORIDE, HAETING THE BATH TO FROM 60* TO 100*F., APPLYING SAID BATH TO THE SURFACES TO BE COATED UNTIL A VISIBLE FILM IS PRODUCED THEREON, AND REPLENISHING THE BATH AS REQUIRED, DURING USE, SO AS TO MAINTAIN THE ACIDITY THEREOF WHICH IS TITRATABLE WITH CAUSTIC TO THE BROM CRESOL GREEN ENDPOINT, AT FROM 0.4 TO 1.0N.
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) | 1963-11-22 | 1964-05-23 | 1964-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-22 | 1968-05-23 | 1968-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-22 | 1972-05-23 | 1972-11-22 | $7700.00 | Window Closed / Lapsed |