US2850419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of passivating silver
Assignee: US Philips Corp
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Filing: 1956-05-14
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Granted: 1958-09-02
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Expires: 1976-05-14
Abstract
No abstract record available.
Inventors
- 👤 Melse Jan Leendert
- 👤 Baeyens Petrus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:11
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/60; C23C22/06; C23C22/24; C23C22/68
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A METHOD OF PASSIVATING SILVER COMPRISING THE STEPS, CONTACTING A SILVER ARTICLE WITH AN AQUEOUS SOLUTION OF AN OXYGEN COMPOUND OF HEXAVALENT CHROMIUM IN AN AMOUNT GREATER THAN ABOUT 5 GRAMS PER LITER AND A WATER-SOLUBLE COMPLEX SILVER ION FORMING COMPOUND IN AN AMOUNT GREATER THAN ABOUT 1 GRAM PER LITER AND ADJUSTING THE RELATIONSHIP OF THE PH AND FREE SILVER ION CONCENTRATION OF SAID SOLUTION WHILE IN CONTACT WITH SAID SILVER ARTICLE TO A POINT TO THE RIGHT OF THE LINE AB IN THE ACCOMPANYING GRAPH.
Claim 2
Independent Claim
87 words
A METHOD OF PASSIVATING SILVER COMPRISING THE STEPS, CONTACTING A SILVER ARTICLE WITH AN AQUEOUS SOLUTION OF AN OXYGEN COMPOUND OF HEXAVALENT CHROMIUM IN AN AMOUNT GREATER THAN ABOUT 5 GRAMS PER LITER AND A WATER-SOLUBLE COMPLEX SILVER ION FORMING COMPOUND IN AN AMOUNT GREATER THAN ABOUT 1 GRAM PER LITER AND ADJUSTING THE RELATIONSHIP OF THE PH AND FREE SILVER ION CONCENTRATION OF SAID SOLUTION WHILE IN CONTACT WITH SAID SILVER ARTICLE TO A POINT TO THE RIGHT OF THE LINE AB IN THE ACCOMPANYING GRAPH.
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) | 1961-09-01 | 1962-03-03 | 1962-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-01 | 1966-03-03 | 1966-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-01 | 1970-03-03 | 1970-09-02 | $7700.00 | Window Closed / Lapsed |