US3189488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solutions and method for coating metal surfaces
Assignee: Henkel Corp
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Filing: 1962-09-24
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Granted: 1965-06-15
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Expires: 1982-09-24
Abstract
No abstract record available.
Inventors
- 👤 Schiffman Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:58
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/82; C23C22/83; C09; C09D; C09D133/00; C09D133/02; C23C22/05; C23C22/06; C23C22/24; C23C22/30; C23C22/33
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
THE METHOD OF APPLYING A COATING TO THE SURFACE OF METALS SELECTED FROM THE CLASS CONSISTING ESSENTIALLY OF IRON, ZINC AND ALUMINUM WHICH METHOD COMPRISES TREATING THE SURFACE WITH AN AQUEOUS BATH, THE COATING PRODUCING INGREDIENTS OF WHICH BATH CONSIST ESSENTIALLY OF: (1) AT LEAST 0.25% BY WEIGHT OF A PRODUCT COMPRISING MIXTURES OF CHROMIC ACID INCLUDING ITS SOLUBLE SALTS AND REDUCED FORMS THEREOF SUCH AS IS DERIVED FROM THE REACTION OF AN AQUEOUS SOLUTION CONSISTING ESSENTIALLY OF FROM 50 TO 800 GRAMS/LITER OF A HEXAVALENT CHROMIUM COMPOUND, EXPRESSED AS CRO3, WITH FROM 0.03 TO 1 MOL OF FORMALDEHYDE, EXPRESSED HCHO, FOR EACH MOL OF SAID HEXAVALENT CHROMIUM COMPOUND, AND (2) AT LEAST 0.1% BY WEIGHT OF WATER SOLUBLE POLYMERS OF HYDROXYETHYL EHTERS OF CELLULOSE, THE TREATMENT BEING CONTINUED UNTIL THE METAL SURFACE IS COMPLETELY WETTED BY THE SOLUTION, AND THEN DRYING THE SURFACE.
Claim 2
Independent Claim
144 words
THE METHOD OF APPLYING A COATING TO THE SURFACE OF METALS SELECTED FROM THE CLASS CONSISTING ESSENTIALLY OF IRON, ZINC AND ALUMINUM WHICH METHOD COMPRISES TREATING THE SURFACE WITH AN AQUEOUS BATH, THE COATING PRODUCING INGREDIENTS OF WHICH BATH CONSIST ESSENTIALLY OF: (1) AT LEAST 0.25% BY WEIGHT OF A PRODUCT COMPRISING MIXTURES OF CHROMIC ACID INCLUDING ITS SOLUBLE SALTS AND REDUCED FORMS THEREOF SUCH AS IS DERIVED FROM THE REACTION OF AN AQUEOUS SOLUTION CONSISTING ESSENTIALLY OF FROM 50 TO 800 GRAMS/LITER OF A HEXAVALENT CHROMIUM COMPOUND, EXPRESSED AS CRO3, WITH FROM 0.03 TO 1 MOL OF FORMALDEHYDE, EXPRESSED HCHO, FOR EACH MOL OF SAID HEXAVALENT CHROMIUM COMPOUND, AND (2) AT LEAST 0.1% BY WEIGHT OF WATER SOLUBLE POLYMERS OF HYDROXYETHYL EHTERS OF CELLULOSE, THE TREATMENT BEING CONTINUED UNTIL THE METAL SURFACE IS COMPLETELY WETTED BY THE SOLUTION, AND THEN DRYING THE SURFACE.
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) | 1968-06-14 | 1968-12-14 | 1969-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-14 | 1972-12-14 | 1973-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-14 | 1976-12-14 | 1977-06-15 | $7700.00 | Window Closed / Lapsed |