US2795518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating steel, zinc, and aluminum to increase corrosion resistance
Assignee: Henkel Corp
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Filing: 1954-04-14
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Granted: 1957-06-11
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Expires: 1974-04-14
Abstract
No abstract record available.
Inventors
- 👤 John A Carroll
- 👤 Jr Nelson J Newhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:10
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/82; C23C22/83
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
IN THE ART OF INCREASING THE CORROSION RESISTANCE OF METAL SURFACES FORM THE CLASS CONSISTING OF STEEL, ZINC AND ALUMINUM, THE PROCESS WHICH CONSISTS IN SUBJECTING THE SURFACE TO THE ACTION OF A PHOSPHATIZING SOLUTION WHICH IN CAPABLE OF PRODUCING A CHEMICALLY BONDED CRYSTALLINE PHOSPHATE COATING ON AT LEAST ONE OF THE METALS FROM THE CLASS WHICH CONSISTS OF STEEL AND ZINC, WATER RINSING THE SURFACE SO TREATED, AND THEN SUBJECTING THE RINSED SURFACE TO THE ACTION OF AN ACIDULATED SOLUTION OF CHROMIC ACID AND A FLUORINE BEARING COMPOUND, THE FLUORINE BEARING COMPOUND BEING CHOSEN FROM THE CLASS OF COMPLEX FLUORIDES WHICH CONSISTS OF FLUOSILICIC ACID, FLUOZIRCONIC ACID, FLUOSTANNIC ACID, FLUOTITANIC ACID AND THE SOLUBLE SALTS OF ANY OF THEM, THE CHROMIC ACID CONCENTRATION LYING BETWEEN 0.30 AND 10 GRAMS PER LITER, THE FLUORINE CONTENT BETWEEN 0.10 AND 10 GRAMS PER LITER WITH THE PROPORTIONS OF BOTH BEING SO CHOSEN AS TO YIELD A SOLUTION THE PH OF WHICH LIES BETWEEN 1.3 AND 4.0
Claim 2
Dependent Claim
164 words
IN THE ART OF INCREASING THE CORROSION RESISTANCE OF METAL SURFACES FORM THE CLASS CONSISTING OF STEEL, ZINC AND ALUMINUM, THE PROCESS WHICH CONSISTS IN SUBJECTING THE SURFACE TO THE ACTION OF A PHOSPHATIZING SOLUTION WHICH IN CAPABLE OF PRODUCING A CHEMICALLY BONDED CRYSTALLINE PHOSPHATE COATING ON AT LEAST ONE OF THE METALS FROM THE CLASS WHICH CONSISTS OF STEEL AND ZINC, WATER RINSING THE SURFACE SO TREATED, AND THEN SUBJECTING THE RINSED SURFACE TO THE ACTION OF AN ACIDULATED SOLUTION OF CHROMIC ACID AND A FLUORINE BEARING COMPOUND, THE FLUORINE BEARING COMPOUND BEING CHOSEN FROM THE CLASS OF COMPLEX FLUORIDES WHICH CONSISTS OF FLUOSILICIC ACID, FLUOZIRCONIC ACID, FLUOSTANNIC ACID, FLUOTITANIC ACID AND THE SOLUBLE SALTS OF ANY OF THEM, THE CHROMIC ACID CONCENTRATION LYING BETWEEN 0.30 AND 10 GRAMS PER LITER, THE FLUORINE CONTENT BETWEEN 0.10 AND 10 GRAMS PER LITER WITH THE PROPORTIONS OF BOTH BEING SO CHOSEN AS TO YIELD A SOLUTION THE PH OF WHICH LIES BETWEEN 1.3 AND 4.0
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) | 1960-06-10 | 1960-12-10 | 1961-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-10 | 1964-12-10 | 1965-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-10 | 1968-12-10 | 1969-06-11 | $7700.00 | Window Closed / Lapsed |