US2902394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective metal coating compositions and method of coating
Assignee: Poor and Co
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Filing: 1956-07-19
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Granted: 1959-09-01
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Expires: 1976-07-19
Abstract
No abstract record available.
Inventors
- 👤 Bruno R Jeremias
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:19
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/24; C23C22/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A PROCESS OF FINISHING ZINC SURFACED ARTICLES WHICH COMPRISES TREATING THE SURFACES OF SUCH ARTICLES WITH AN AQEUOUS SOLUTION OF CHROMIC ACID CONTAINING 3 TO 90 GRAMS PER LITER OF CHROMIUM OF WHICH AT LEAST 0.015 GRAM PER LITER BUT NOT MORE THAN ABOUT 4.4 GRAMS PER LITER IS CHROMIUM IN A TRIVALENT STATE, THE REMAINDER BEING CHROMIUM, IN A HEXAVALENT STATE, 0.3 TO 0.6 GRAM PER LITER OF ACETIC ACID, 0.6 TO 1.2 GRMAS PER LITER OF SULFURIC ACID, AND ABOUT 2.25 GRAMS PER LITER OF 4.5 GRAMS PER LITER OF NITRIC ACID, THE WEIGHT RATIO OF SULFURIC ACID TO ACETIC ACID BEING APPROXIMATELY 2:1 AND THE WEIGHT RATIO OF SO4--:CRO4--BEING WITHIN THE RANGE OF ABOUT 1:4 TO 1:16.
Claim 2
Dependent Claim
120 words
A PROCESS OF FINISHING ZINC SURFACED ARTICLES WHICH COMPRISES TREATING THE SURFACES OF SUCH ARTICLES WITH AN AQEUOUS SOLUTION OF CHROMIC ACID CONTAINING 3 TO 90 GRAMS PER LITER OF CHROMIUM OF WHICH AT LEAST 0.015 GRAM PER LITER BUT NOT MORE THAN ABOUT 4.4 GRAMS PER LITER IS CHROMIUM IN A TRIVALENT STATE, THE REMAINDER BEING CHROMIUM, IN A HEXAVALENT STATE, 0.3 TO 0.6 GRAM PER LITER OF ACETIC ACID, 0.6 TO 1.2 GRMAS PER LITER OF SULFURIC ACID, AND ABOUT 2.25 GRAMS PER LITER OF 4.5 GRAMS PER LITER OF NITRIC ACID, THE WEIGHT RATIO OF SULFURIC ACID TO ACETIC ACID BEING APPROXIMATELY 2:1 AND THE WEIGHT RATIO OF SO4--:CRO4--BEING WITHIN THE RANGE OF ABOUT 1:4 TO 1:16.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-31 | 1963-03-02 | 1963-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-31 | 1967-03-02 | 1967-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-31 | 1971-03-02 | 1971-09-01 | $7700.00 | Window Closed / Lapsed |