US2906677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic treatment of tinplate
Assignee: National Steel Corp
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Filing: 1955-03-17
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Granted: 1959-09-29
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Expires: 1975-03-17
Abstract
No abstract record available.
Inventors
- 👤 Edwin J Smith
- 👤 John R Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:55
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
207 words
THE METHOD OF IMPROVING THE YELLOW DISCOLORATION RESISTANCE OF TINPLATE WHICH COMPRISES THE STEPS OF ANODICALLY TREATING TINPLATE IN AN AQUEOUS CHROMATE-FREE, ACIDIC BATH AND FIMALLY CATHODICALLY TREATING THE ANODICALLY TREATED TINPLATE IN AN AQUEOUS CHROMATE-FREE, ACIDIC BATH, THE ANODIC AND CATHODIC TREAMENT VALUES RANGING FROM 1 TO 12 AMPERE SECONDS PER SQUARE FOOT OF SURFACE AREA TREATED, THE AQUEOUS CHROMATE-FREE ACIDIC BATH IN EACH OF THE TREATMENTS CONSISTING ESSENTIALLY OF AT LEAST ONE PHOSPHATE SELECTED FROM THE GROUP CONSISTING OF SODIUM DIHYDROGEN PHOSPHATE AND POTASSIUM DIHYDROGEN PHOSPHATE AND AT LEAST ONE NITRATE SELECTED FROM THE GROUP CONSISTING OF SODIUM NITRATE AND POTASSIUM NITRATE DISSOLVED IN THE AQUEOUS BATH AS ADDITIVE INGREDIENTS, THE AMOUNT OF DIHYDROGEN PHOSPHATE IN THE BATH RANGING FROM 1 TO 6 OUNCES PER GALLON OF SOLUTION WHEN CALCULATED AS SODIUM DIHYDROGEN PHOSPHATE, THE RATIO BY WEIGHT OF PHOSPHATE TO NITRATE RANGING FROM 30:1 TO 1:1 WHEN CALCULATED ON THE BASIS OF THE SODIUM SALTS FOR ALL ANODIC TREATMENT VALUES UP TO 6 AMPERE SECONDS PER SQUARE FOOT, AND THE RATIO BY WEIGHT OF PHOSPHATE TO NITRATE RANGING FROM 30:1 TO 3:1 WHEN CALCULATED ON THE BASIS OF THE SODIUM SALTS FOR ANODIC TREAMENT VALUES OF AT LEAST 6 AMPERE SECONDS PER SQUARE FOOT.
Claim 2
Independent Claim
207 words
THE METHOD OF IMPROVING THE YELLOW DISCOLORATION RESISTANCE OF TINPLATE WHICH COMPRISES THE STEPS OF ANODICALLY TREATING TINPLATE IN AN AQUEOUS CHROMATE-FREE, ACIDIC BATH AND FIMALLY CATHODICALLY TREATING THE ANODICALLY TREATED TINPLATE IN AN AQUEOUS CHROMATE-FREE, ACIDIC BATH, THE ANODIC AND CATHODIC TREAMENT VALUES RANGING FROM 1 TO 12 AMPERE SECONDS PER SQUARE FOOT OF SURFACE AREA TREATED, THE AQUEOUS CHROMATE-FREE ACIDIC BATH IN EACH OF THE TREATMENTS CONSISTING ESSENTIALLY OF AT LEAST ONE PHOSPHATE SELECTED FROM THE GROUP CONSISTING OF SODIUM DIHYDROGEN PHOSPHATE AND POTASSIUM DIHYDROGEN PHOSPHATE AND AT LEAST ONE NITRATE SELECTED FROM THE GROUP CONSISTING OF SODIUM NITRATE AND POTASSIUM NITRATE DISSOLVED IN THE AQUEOUS BATH AS ADDITIVE INGREDIENTS, THE AMOUNT OF DIHYDROGEN PHOSPHATE IN THE BATH RANGING FROM 1 TO 6 OUNCES PER GALLON OF SOLUTION WHEN CALCULATED AS SODIUM DIHYDROGEN PHOSPHATE, THE RATIO BY WEIGHT OF PHOSPHATE TO NITRATE RANGING FROM 30:1 TO 1:1 WHEN CALCULATED ON THE BASIS OF THE SODIUM SALTS FOR ALL ANODIC TREATMENT VALUES UP TO 6 AMPERE SECONDS PER SQUARE FOOT, AND THE RATIO BY WEIGHT OF PHOSPHATE TO NITRATE RANGING FROM 30:1 TO 3:1 WHEN CALCULATED ON THE BASIS OF THE SODIUM SALTS FOR ANODIC TREAMENT VALUES OF AT LEAST 6 AMPERE SECONDS PER SQUARE FOOT.
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) | 1962-09-28 | 1963-03-30 | 1963-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-28 | 1967-03-30 | 1967-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-28 | 1971-03-30 | 1971-09-29 | $7700.00 | Window Closed / Lapsed |