Patent US3189489A successfully refreshed from Google Patents.
US3189489A
Expired / Lapsed
US
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Method and solutions for treating 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
2026-10-27 14:37
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
142 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 ESSENTAILLY OF: (1) MIXTURES OF CHROMIC ACID INCLUDING ITS SOLUBLE SALTS AND REDUCED FORMS THEREOF SUCH AS ARE DERIVED FROM THE REACTION OF AN AQUEOUS SOLUTION CONSISTING ESSENTIALLY OF FROM 50 TO 800G./L. OF A HEXAVALENT CHROMIUM COMPOUND, EXPRESSED AS CRO3, EITH FROM 0.03 TO 1 MOL OF FORMALDEHYDE, EXPRESSED AS HCHO, FOR EACH MOL OF SAID HEXAVALENT CHROMIUM COMPOUND, AND (2) A POLYVINYL ALCOHOL COMPOUND THE QUANTITY OF EACH OF (1) AND (2) IN THE BATH BEING NOT LESS THAN 0.25% BY WEIGHT, THE TREATMENT BEING CONTINUED UNTIL THE SURFACE IS COMPLETELY WETTED BY THE SOLUTION, AND THEN DRYING THE SURFACE.
Claim 2
Independent Claim
142 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 ESSENTAILLY OF: (1) MIXTURES OF CHROMIC ACID INCLUDING ITS SOLUBLE SALTS AND REDUCED FORMS THEREOF SUCH AS ARE DERIVED FROM THE REACTION OF AN AQUEOUS SOLUTION CONSISTING ESSENTIALLY OF FROM 50 TO 800G./L. OF A HEXAVALENT CHROMIUM COMPOUND, EXPRESSED AS CRO3, EITH FROM 0.03 TO 1 MOL OF FORMALDEHYDE, EXPRESSED AS HCHO, FOR EACH MOL OF SAID HEXAVALENT CHROMIUM COMPOUND, AND (2) A POLYVINYL ALCOHOL COMPOUND THE QUANTITY OF EACH OF (1) AND (2) IN THE BATH BEING NOT LESS THAN 0.25% BY WEIGHT, THE TREATMENT BEING CONTINUED UNTIL THE SURFACE IS COMPLETELY WETTED BY THE SOLUTION, AND THEN DRYING THE SURFACE.
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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) | 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 |