Patent US2768103A successfully refreshed from Google Patents.
US2768103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for coating metals
Assignee: Heintz Manufacturing Co
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Filing: 1952-03-18
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Granted: 1956-10-23
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Expires: 1972-03-18
Abstract
No abstract record available.
Inventors
- 👤 Schuster Ludwig Karl
- 👤 Jr Alfonso L Baldi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:18
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/82; C23C22/83
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
149 words
A METHOD FOR FORMING A CORROSION-RESISTANT, LACQUER-ADHERING SURFACE ON A FERROUS METAL, COMPRISING ETCHING SAID METAL WITH A NITRIC ACID BATH HAVING A CONCENTRATION OF FROM 1% TO 20% HNO3 BY WEIGHT FOR A PERIOD OF 2 TO 70 SECOND AT A TEMPERATURE OF 60-150* F., THE LOWER TIMES BEING USED WITH THE HIGHER CONCENTRATIONS, RINSING OFF THE METAL SO TREATED, CONTACTING THE RINSED METAL WITH A CHROMIC ACID SOLUTION CONTAINING FROM ABOUT 1/2% TO ABOUT 30% CRO3 FOR A PERIOD OF AT LEAST 1 SECOND AT A TEMPERATURE OF ABOUT 50 TO ABOUT 200* F., REMOVING THE CONTACTED METAL FROM THE SOLUTION SO THAT A FILM OF THE SOLUTION REMAINS ON THE SURFACE OF THE METAL, AND DRYING THIS FILM ON THE SURFACE OF THE REMOVAL METAL WHILE CHEMICALLY REDUCING A PORTION OF THE CHROMIC ACID IN THE FILM WITH A REDUCING AGENT AS THE DRYING IS EFFECTED.
Claim 2
Independent Claim
149 words
A METHOD FOR FORMING A CORROSION-RESISTANT, LACQUER-ADHERING SURFACE ON A FERROUS METAL, COMPRISING ETCHING SAID METAL WITH A NITRIC ACID BATH HAVING A CONCENTRATION OF FROM 1% TO 20% HNO3 BY WEIGHT FOR A PERIOD OF 2 TO 70 SECOND AT A TEMPERATURE OF 60-150* F., THE LOWER TIMES BEING USED WITH THE HIGHER CONCENTRATIONS, RINSING OFF THE METAL SO TREATED, CONTACTING THE RINSED METAL WITH A CHROMIC ACID SOLUTION CONTAINING FROM ABOUT 1/2% TO ABOUT 30% CRO3 FOR A PERIOD OF AT LEAST 1 SECOND AT A TEMPERATURE OF ABOUT 50 TO ABOUT 200* F., REMOVING THE CONTACTED METAL FROM THE SOLUTION SO THAT A FILM OF THE SOLUTION REMAINS ON THE SURFACE OF THE METAL, AND DRYING THIS FILM ON THE SURFACE OF THE REMOVAL METAL WHILE CHEMICALLY REDUCING A PORTION OF THE CHROMIC ACID IN THE FILM WITH A REDUCING AGENT AS THE DRYING IS EFFECTED.
References Cited (Backward Citations)
US2067214A
Cited
US2210850A
Cited
US2303242A
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US2314565A
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US2301983A
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US2315564A
Cited
GB586517A
Cited
GB597754A
Cited
US2535794A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-23 | 1960-04-23 | 1960-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-23 | 1964-04-23 | 1964-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-23 | 1968-04-23 | 1968-10-23 | $7700.00 | Window Closed / Lapsed |