US2524577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dip process for coloring cadmium
Assignee: United Chromium Inc
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Filing: 1948-08-10
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Granted: 1950-10-03
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Expires: 1968-08-10
Abstract
No abstract record available.
Inventors
- 👤 Stareck Jesse Edwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:12
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/24; C23C22/34; C23C22/37
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A METHOD OF FORMING BLACK SURFACE CONVERSION COATINGS ON CADMIUM CONSISTING IN DIPPING THE CADMIUM IN A WATER SOLUTION CONSISTING ESSENTIALLY OF A HEXAVALENT CHROMIUM COMPOUND OF THE GROUP CONSISTING OF CHROMIC ACID, AN ALKALI-METAL CHROMATE, AND AN ALKALI-METAL DICHROMATE, A WATER SOLUBLE ACID OR SALT CONTAINING AN ACTIVATING OR AUXILIARY ACID RADICAL OF THE GOUP CONSISTING OF SULPHATE RADICALS AND FLUORIDE RADICALS, AND A WATER SOLUBLE SILVER COMPOUND, THE AMOUNTS BY WEIGHT BEING: CR**VI OF THE HEXAVALENT CHROMIUM COMPOUND -15 TO 45 G./L., ACTIVATING ACID RADICAL OF THE COMPOUND CONTAINING IT -40 TO 100 G./1., AND SILVER COMPOUND-FEW TENTHS OF A G./1., AND THEN REMOVING THE CADMIUM FROM THE SOLUTION.
Claim 2
Independent Claim
111 words
A METHOD OF FORMING BLACK SURFACE CONVERSION COATINGS ON CADMIUM CONSISTING IN DIPPING THE CADMIUM IN A WATER SOLUTION CONSISTING ESSENTIALLY OF A HEXAVALENT CHROMIUM COMPOUND OF THE GROUP CONSISTING OF CHROMIC ACID, AN ALKALI-METAL CHROMATE, AND AN ALKALI-METAL DICHROMATE, A WATER SOLUBLE ACID OR SALT CONTAINING AN ACTIVATING OR AUXILIARY ACID RADICAL OF THE GOUP CONSISTING OF SULPHATE RADICALS AND FLUORIDE RADICALS, AND A WATER SOLUBLE SILVER COMPOUND, THE AMOUNTS BY WEIGHT BEING: CR**VI OF THE HEXAVALENT CHROMIUM COMPOUND -15 TO 45 G./L., ACTIVATING ACID RADICAL OF THE COMPOUND CONTAINING IT -40 TO 100 G./1., AND SILVER COMPOUND-FEW TENTHS OF A G./1., AND THEN REMOVING THE CADMIUM FROM THE SOLUTION.
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) | 1953-10-02 | 1954-04-03 | 1954-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-02 | 1958-04-03 | 1958-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-02 | 1962-04-03 | 1962-10-03 | $7700.00 | Window Closed / Lapsed |