US3960564A
Expired / Lapsed
US
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Physical development process utilizing a physical developer containing a specific reducing agent, a thiol compound
Assignee: US Philips Corp
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Filing: 1974-10-24
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Granted: 1976-06-01
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Expires: 1994-10-24
Abstract
Abstract A solution for the selective electroless deposition of silver comprising as essential constituents silver salt, ammonium hydroxide and a reducer chosen from tartrate, formaldehyde or hydrazine and an organic compound having one or more cyclic or polar aliphatic groups on the one hand and an SH-group on the other hand.
Inventors
- 👤 Arian Molenaar
- 👤 Hendrik Jonker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:37
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/31; C23C18/42; C23C18/44; C23C18/1601; C23C18/1603; C23C18/1607; C23C18/1608; G; G03; G03C; G03C5/00; G03C5/58
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
152 words
In the method of producing a carrier with a silver coating by first providing physically developable metal nuclei image produced by selective exposure of a photo-sensitive layer on a carrier and then physically developing said metal nuclei image with an aqueous solution of a silver salt an a reducing agent therefor, the improvement where after formation of the metal nuclei image the carrier is rinsed with a solution comprising ammonium hydroxide or a soluble pyrophosphate and the carrier is then treated with an electroless silver plating composition comprising an aqueous solution of a silver salt, ammonium hydroxide as a complexing compound for silver ions, a reducing agent selected from the group consisting of soluble tartrates, formaldehyde and hydrazine and in addition an organic compound containing at least one --SH group and at least one cyclic or polar aliphatic group in a concentration of between 10 - 7 and 10 - 2 mol/liter.
Claim 2
Dependent Claim
152 words
In the method of producing a carrier with a silver coating by first providing physically developable metal nuclei image produced by selective exposure of a photo-sensitive layer on a carrier and then physically developing said metal nuclei image with an aqueous solution of a silver salt an a reducing agent therefor, the improvement where after formation of the metal nuclei image the carrier is rinsed with a solution comprising ammonium hydroxide or a soluble pyrophosphate and the carrier is then treated with an electroless silver plating composition comprising an aqueous solution of a silver salt, ammonium hydroxide as a complexing compound for silver ions, a reducing agent selected from the group consisting of soluble tartrates, formaldehyde and hydrazine and in addition an organic compound containing at least one --SH group and at least one cyclic or polar aliphatic group in a concentration of between 10 - 7 and 10 - 2 mol/liter.
Claim 3
Dependent Claim
18 words
A carrier having a surface coated with a silver image as provided by the method of claim 7.
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) | 1979-06-01 | 1979-12-01 | 1980-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-01 | 1983-12-01 | 1984-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-01 | 1987-12-01 | 1988-06-01 | $7700.00 | Window Closed / Lapsed |