US3202551A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing adherent coatings on iron and steel parts
Assignee: Hoechst AG
•
Filing: 1962-09-07
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Granted: 1965-08-24
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Expires: 1982-09-07
Abstract
No abstract record available.
Inventors
- 👤 Gerischer Heinz
- 👤 Herbst Willy
- 👤 Ludwig Heinz
- 👤 Schaefer Helmut
- 👤 Wagner Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:15
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/82; C23C22/83; C23C22/78
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
THE METHOD OF PRODUCING ADHERENT UNIFORM COATINGS ON IRON AND STEEL PARTS, PARTICULARLY FOR PREVENTING CORROSION AND PROVIDING ADHERENCE OF LACQUERS AND VARNISHES, WHICH METHOD CONSISTS ESSENTIALLY OF CONTACTING THE SURFACE OF SAID METAL PARTS IN A FIRST STEP AT A TEMPERATURE BETWEEN ABOUT 3*C. AND ABOUT 80*C. WITH AN AQUEOUS SOLUTION (I) CONTAINING ABOUT 0.5% BY WEIGHT TO ABOUT 20% BY WEIGHT OF AT LEAST ONE ALIPHATIC HYDROXYCARBOXYLIC ACID WITH 1 TO 3 COOH-GROUPS AND HAVING NOT MORE THAN 6 C-ATOMS IN ITS MOLECULE, SUBSEQUENTLY IN A SECOND STEP AT A TEMPERATURE BETWEEN ABOUT 3*C. TO ABOUT 80*C. WITH AN AQUEOUS SOLTUION (II) CONTAINING ABOUT 0.1% BY WEIGHT TO ABOUT 10% BY WEIGHT OF CHROMIC ACID, AND RINSING THE SURFACE OF THE METAL PARTS THUS TREATED IN A THIRD STEP AT A TEMPEATURE BETWEEN ABOUT 3*C. AND ABOUT 80*C. WITH AT LEAST ONE LIQUID (III) SELECTED FROM THE GROUP CONSISTING OF WATER AND AN AQUEOUS SOLUTION CONTAINING CHROMIC ACID IN A CONCENTRATION NOT EXCEEDING 0.08% BY WEIGHT.
Claim 2
Independent Claim
168 words
THE METHOD OF PRODUCING ADHERENT UNIFORM COATINGS ON IRON AND STEEL PARTS, PARTICULARLY FOR PREVENTING CORROSION AND PROVIDING ADHERENCE OF LACQUERS AND VARNISHES, WHICH METHOD CONSISTS ESSENTIALLY OF CONTACTING THE SURFACE OF SAID METAL PARTS IN A FIRST STEP AT A TEMPERATURE BETWEEN ABOUT 3*C. AND ABOUT 80*C. WITH AN AQUEOUS SOLUTION (I) CONTAINING ABOUT 0.5% BY WEIGHT TO ABOUT 20% BY WEIGHT OF AT LEAST ONE ALIPHATIC HYDROXYCARBOXYLIC ACID WITH 1 TO 3 COOH-GROUPS AND HAVING NOT MORE THAN 6 C-ATOMS IN ITS MOLECULE, SUBSEQUENTLY IN A SECOND STEP AT A TEMPERATURE BETWEEN ABOUT 3*C. TO ABOUT 80*C. WITH AN AQUEOUS SOLTUION (II) CONTAINING ABOUT 0.1% BY WEIGHT TO ABOUT 10% BY WEIGHT OF CHROMIC ACID, AND RINSING THE SURFACE OF THE METAL PARTS THUS TREATED IN A THIRD STEP AT A TEMPEATURE BETWEEN ABOUT 3*C. AND ABOUT 80*C. WITH AT LEAST ONE LIQUID (III) SELECTED FROM THE GROUP CONSISTING OF WATER AND AN AQUEOUS SOLUTION CONTAINING CHROMIC ACID IN A CONCENTRATION NOT EXCEEDING 0.08% BY WEIGHT.
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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) | 1968-08-23 | 1969-02-22 | 1969-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-23 | 1973-02-22 | 1973-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-23 | 1977-02-22 | 1977-08-24 | $7700.00 | Window Closed / Lapsed |