Patent US2838448A successfully refreshed from Google Patents.
US2838448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copper and brass plating brightener
Assignee: Individual
•
Filing: 1957-07-17
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Granted: 1958-06-10
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Expires: 1977-07-17
Abstract
No abstract record available.
Inventors
- 👤 Daniel R France
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:28
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/38; C25D3/40; C25D3/56; C25D3/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A PLATING SOLUTION BRIGHTENER FOR PRODUCING BRIGHT DUCTILE DEPOSITS OF A METAL SELECTED FROM THE GROUP CONSISTING OF COPPER AND BRASS FROM ALKALINE-CYANIDE ELECTROPLATING SOLUTIONS COMPRISING THE FOLLOWING IN SUBSTANTIALLY THE FOLLOWING PROPORTIONS, TWO OUNCES OF SODIUM ARSENITE, TEN TO TWENTY OUNCES SODIUM NITRATE, TEN OUNCES SODIUM ZINCATE, TWENTY OUNCES SODIUM HYDROXIDE, SIXTEEN OUNCES METHYL ALCOHOL, SIXTEEN OUNCES FORMALDEHYDE, THIRTY-TWO OUNCES WETTING AGENT, ONE TO FIVE GRAMS TETRAETHYLRHODAMINE AND WATER SUFFICIENT TO MAKE ONE GALLON OF BRIGHTENER.
Claim 2
Dependent Claim
77 words
A PLATING SOLUTION BRIGHTENER FOR PRODUCING BRIGHT DUCTILE DEPOSITS OF A METAL SELECTED FROM THE GROUP CONSISTING OF COPPER AND BRASS FROM ALKALINE-CYANIDE ELECTROPLATING SOLUTIONS COMPRISING THE FOLLOWING IN SUBSTANTIALLY THE FOLLOWING PROPORTIONS, TWO OUNCES OF SODIUM ARSENITE, TEN TO TWENTY OUNCES SODIUM NITRATE, TEN OUNCES SODIUM ZINCATE, TWENTY OUNCES SODIUM HYDROXIDE, SIXTEEN OUNCES METHYL ALCOHOL, SIXTEEN OUNCES FORMALDEHYDE, THIRTY-TWO OUNCES WETTING AGENT, ONE TO FIVE GRAMS TETRAETHYLRHODAMINE AND WATER SUFFICIENT TO MAKE ONE GALLON OF BRIGHTENER.
References Cited (Backward Citations)
US2198365A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-09 | 1961-12-09 | 1962-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-09 | 1965-12-09 | 1966-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-09 | 1969-12-09 | 1970-06-10 | $7700.00 | Window Closed / Lapsed |