US2883288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver plating bath
Assignee: Lewco Inc
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Filing: 1955-08-17
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Granted: 1959-04-21
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Expires: 1975-08-17
Abstract
No abstract record available.
Inventors
- 👤 David L Dobbs
- 👤 Jr Robert F Gill
- 👤 Ronald B Howes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:06
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/31; C23C18/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
A PLATING BATH OF THE DEPOSITION OF SILVER UPON A COPPER-CONTAINING METAL SURFACE BY CHEMICAL DISPLACEMENT CONSISTING ESSENTIALLY OF AN ACIDIFIED SOLUTION OF THIOUREA, A SILVER SALT, AN ACIDIFYING AGENT, AND SULFIDE IONS, SAID SOLUTION HAVING A PH OF BETWEEN 1.0 AND 2.4 AND PROVIDING SILVER IONS IN SUFFICIENT CONCENTRATION TO EFFECT A USEFUL SILVER DEPOSIT UPON SAID METAL SURFACE, SAID THIOUREA BEING PROESENT IN AN AMOUNT EQUAL TO FROM ABOUT 16 TO ABOUT 79 TIMES THE WEIGHT OF SILVER, AND SAID SULFIDE IONS BEIG PRESENT IN AN EFFECTIVE AMOUNT BUT LESS THAN ABOUT 10 GRAMS PER LITER OF SOLUTION.
Claim 2
Dependent Claim
100 words
A PLATING BATH OF THE DEPOSITION OF SILVER UPON A COPPER-CONTAINING METAL SURFACE BY CHEMICAL DISPLACEMENT CONSISTING ESSENTIALLY OF AN ACIDIFIED SOLUTION OF THIOUREA, A SILVER SALT, AN ACIDIFYING AGENT, AND SULFIDE IONS, SAID SOLUTION HAVING A PH OF BETWEEN 1.0 AND 2.4 AND PROVIDING SILVER IONS IN SUFFICIENT CONCENTRATION TO EFFECT A USEFUL SILVER DEPOSIT UPON SAID METAL SURFACE, SAID THIOUREA BEING PROESENT IN AN AMOUNT EQUAL TO FROM ABOUT 16 TO ABOUT 79 TIMES THE WEIGHT OF SILVER, AND SAID SULFIDE IONS BEIG PRESENT IN AN EFFECTIVE AMOUNT BUT LESS THAN ABOUT 10 GRAMS PER LITER OF 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) | 1962-04-20 | 1962-10-20 | 1963-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-20 | 1966-10-20 | 1967-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-20 | 1970-10-20 | 1971-04-21 | $7700.00 | Window Closed / Lapsed |