US2768104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for coating iron
Assignee: Heintz Manufacturing Co
•
Filing: 1952-03-25
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Granted: 1956-10-23
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Expires: 1972-03-25
Abstract
No abstract record available.
Inventors
- 👤 Ludwig K Schuster
- 👤 Jr Alfonso L Baldi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:17
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/82; C23C22/83; C23C22/05; C23C22/06; C23C22/24; C23C22/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A METHOD FOR INCREASING THE CORROSION RESISTANCE AND LACQUER ADHESION OF FERROUS METAL WHICH METHOD COMPRISES CONTACTING A CLEAN SURFACE OF SAID FERROUS METAL FOR AT LEAST ONE SECOND WITH AN AQUEOUS SOLUTION CONSISTING ESSENTIALLY OF ABOUT 1/2 TO ABOUT 30% CHROMIC ACID AND ABOUT 1/4 TO 25% OF A REDUCING AGENT SELECTED FROM THE CLASS CONSISTING OF POLYALCOHOLS, POTASSIUM IODIDE, PHENOL, HYDROQUINONE, PHOSPHOROUS ACID AND HYDROXYLAMINE SULFATE, THE CONCENTRATION OF REDUCING AGENT BEING LESS THAN THE CONCENTRATION OF CHROMIC ACID AND THE BATH TEMPERATURE BEING BETWEEN ABOUT 50 AND 200* F., WITHDRAWING THE CONTACTED METAL FROM THE SOLUTION TO LEAVE A FILM OF THE SOLUTION ON THE SURFACE OF THE METAL, AND THEY DRYING THE FILM ON THE SURFACE OF THE METAL AT A TEMPERATURE ABOVE THE BOILING POINT OF WATER
Claim 2
Independent Claim
132 words
A METHOD FOR INCREASING THE CORROSION RESISTANCE AND LACQUER ADHESION OF FERROUS METAL WHICH METHOD COMPRISES CONTACTING A CLEAN SURFACE OF SAID FERROUS METAL FOR AT LEAST ONE SECOND WITH AN AQUEOUS SOLUTION CONSISTING ESSENTIALLY OF ABOUT 1/2 TO ABOUT 30% CHROMIC ACID AND ABOUT 1/4 TO 25% OF A REDUCING AGENT SELECTED FROM THE CLASS CONSISTING OF POLYALCOHOLS, POTASSIUM IODIDE, PHENOL, HYDROQUINONE, PHOSPHOROUS ACID AND HYDROXYLAMINE SULFATE, THE CONCENTRATION OF REDUCING AGENT BEING LESS THAN THE CONCENTRATION OF CHROMIC ACID AND THE BATH TEMPERATURE BEING BETWEEN ABOUT 50 AND 200* F., WITHDRAWING THE CONTACTED METAL FROM THE SOLUTION TO LEAVE A FILM OF THE SOLUTION ON THE SURFACE OF THE METAL, AND THEY DRYING THE FILM ON THE SURFACE OF THE METAL AT A TEMPERATURE ABOVE THE BOILING POINT OF WATER
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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) | 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 |