US3072516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solution and method for brightening cadmium
Assignee: Conversion Chemical Corp
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Filing: 1961-03-21
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Granted: 1963-01-08
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Expires: 1981-03-21
Abstract
No abstract record available.
Inventors
- 👤 Kenneth P Bellinger
- 👤 Eugene G Chapdelaine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:22
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/34; C23F; C23F3/00; C23F3/04; C23F3/06; C23C2222/00; C23C2222/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
103 words
THE METHOD OF BRIGHTENING CADMIUM SURFACES COMPRISING PROVIDING A DILUTE AQUEOUS SOLUTION CONTAINING ESSENTIALLY 0.08-1.0 GRAM PER LITER OF TRIVALENT CHROMIUM IONS, 0.1-18.0 GRAMS PER LITER OF NITRATE IONS AND 0.4-5.2 GRAMS PER LITER OF IONS SELECTED FROM THE GROUP CONSISTING OF FLUORIDE, SULFATE, AND THE COMBINATION THEREOF, SAID SOLUTION HAVING A PH OF ABOUT 1.0-3.5 AND CONTAINING LESS THAN ABOUT 0.3 GRAM PER LITER OF HEXAVALENT CHROMIUM IONS; MAINTAINING SAID SOLUTION AT A TEMPERATURE OF ABOUT 45-150*F., IMMERSING A CADMIUM WORKPIECE IN SAID SOLUTION FOR A PERIODD OF TIME SUFFICIENT TO BRIGHTEN THE SURFACE THEREOF; AND RINSING SAID WORKPIECE IN COLD WATER.
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) | 1966-01-07 | 1966-07-09 | 1967-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-07 | 1970-07-09 | 1971-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-07 | 1974-07-09 | 1975-01-08 | $7700.00 | Window Closed / Lapsed |