US2796372A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion protecting metal finishing composition
Assignee: Poor and Co
•
Filing: 1953-05-07
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Granted: 1957-06-18
•
Expires: 1973-05-07
Abstract
No abstract record available.
Inventors
- 👤 Allan E Chester
- 👤 Bruno R Jeremias
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:30
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/24; C23C22/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
AN AQUEOUS ACIDIC METAL TREATING SOLUTION CONSISTING ESSENTIALLY OF 1.5 TO 80 GRAMS PER LITER, CALCULATED AS CR, OF DICHROMATE DISSOLVED IN AN AQUEOUS SOLUTION OF AN ACID FROM THE GROUP CONSISTING OF HYDROCHLORIC ACID AND NITRIC ACID HAVNG A PH NOT GREATER THAN 2.0, A QUANTITY OF NON-ACIDIC SULFATE, CALCULATED AS NA2SO4, TO DICHROMATE, CALCULATED AS NA2CR2O7.2H2O, WITHIN THE RANGE OF 1:30 AND 1:9 DISSOLVED IN SAID SOLUTION, FROM 2.5 TO 25 PARTS BY WEIGHT, CALCULATED AS SODIUM ACETATE, OF A LOWER ALIPHATIC CARBOXYLIC ACID SALT PER 90 PARTS BY WEIGHT OF NA2CR2O7.2H2O, AND A QUANTITY OF AN INORGANIC REDUCING AGENT WHICH DOES NOT FORM INSOLUBLE SULFATES IN SAID SOLUTION DISSOLVED IN SAID SOLUTION ON AN AMOUNT SUFFICIENT TO REDUCE AT LEAST 0.5% AND NOT MORE THAN 5% OF THE HEXAVALENT CHROMIUM IN SAID SOLUTION TO THE TRIVALENT STATE.
Claim 2
Dependent Claim
140 words
AN AQUEOUS ACIDIC METAL TREATING SOLUTION CONSISTING ESSENTIALLY OF 1.5 TO 80 GRAMS PER LITER, CALCULATED AS CR, OF DICHROMATE DISSOLVED IN AN AQUEOUS SOLUTION OF AN ACID FROM THE GROUP CONSISTING OF HYDROCHLORIC ACID AND NITRIC ACID HAVNG A PH NOT GREATER THAN 2.0, A QUANTITY OF NON-ACIDIC SULFATE, CALCULATED AS NA2SO4, TO DICHROMATE, CALCULATED AS NA2CR2O7.2H2O, WITHIN THE RANGE OF 1:30 AND 1:9 DISSOLVED IN SAID SOLUTION, FROM 2.5 TO 25 PARTS BY WEIGHT, CALCULATED AS SODIUM ACETATE, OF A LOWER ALIPHATIC CARBOXYLIC ACID SALT PER 90 PARTS BY WEIGHT OF NA2CR2O7.2H2O, AND A QUANTITY OF AN INORGANIC REDUCING AGENT WHICH DOES NOT FORM INSOLUBLE SULFATES IN SAID SOLUTION DISSOLVED IN SAID SOLUTION ON AN AMOUNT SUFFICIENT TO REDUCE AT LEAST 0.5% AND NOT MORE THAN 5% OF THE HEXAVALENT CHROMIUM IN SAID SOLUTION TO THE TRIVALENT STATE.
References Cited (Backward Citations)
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US2106904A
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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) | 1960-06-17 | 1960-12-17 | 1961-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-17 | 1964-12-17 | 1965-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-17 | 1968-12-17 | 1969-06-18 | $7700.00 | Window Closed / Lapsed |