US2920019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic treatment of black plate and product
Assignee: National Steel Corp
•
Filing: 1957-05-17
•
Granted: 1960-01-05
•
Expires: 1977-05-17
Abstract
No abstract record available.
Inventors
- 👤 Edwin J Smith
- 👤 John R Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:25
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A METHOD OF IMPROVING THE CORROSION RESISTANCE OF BLACK PLATE WHICH COMPRISES THE STEP OF ANODICALLY TREATING THE BLACK PLATE IN AN AQUEOUS ACIDIC BATH CONSISTING ESSENTIALLY OF AT LEAST ONE PHOSPHATE SELECTED FROM THE GROUP CONSISTING OF SODIUM DIHYDROGEN PHOSPHATE AND POTASSIUM DIHYDROGEN PHOSPHATE, THE AMOUNT OF DIHYDROGEN PHOSPHATE IN THE BATH BEING FROM 1 TO 15 OUNCES PER GALLON OF SOLUTION WHEN CALCULATED AS SODIUM DIHYDROGEN PHOSPHATE MONOHYDRATE.
Claim 2
Independent Claim
70 words
A METHOD OF IMPROVING THE CORROSION RESISTANCE OF BLACK PLATE WHICH COMPRISES THE STEP OF ANODICALLY TREATING THE BLACK PLATE IN AN AQUEOUS ACIDIC BATH CONSISTING ESSENTIALLY OF AT LEAST ONE PHOSPHATE SELECTED FROM THE GROUP CONSISTING OF SODIUM DIHYDROGEN PHOSPHATE AND POTASSIUM DIHYDROGEN PHOSPHATE, THE AMOUNT OF DIHYDROGEN PHOSPHATE IN THE BATH BEING FROM 1 TO 15 OUNCES PER GALLON OF SOLUTION WHEN CALCULATED AS SODIUM DIHYDROGEN PHOSPHATE MONOHYDRATE.
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) | 1963-01-04 | 1963-07-06 | 1964-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-04 | 1967-07-06 | 1968-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-04 | 1971-07-06 | 1972-01-05 | $7700.00 | Window Closed / Lapsed |