US3983266A
Expired / Lapsed
US
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Method for applying metallic silver to a substrate
Assignee: Peacock Laboratories Inc
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Filing: 1974-10-09
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Granted: 1976-09-28
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Expires: 1994-10-09
Abstract
Abstract High efficiency deposition of silver on the surface of a substrate is obtained by providing a solution containing reducible dissolved silver in the presence of an alkali metal hydroxide and ammonia, all of which are applied to the substrate in the presence of an aqueous solution of a moderating reducer containing a polyhydric alcohol of the formula CH 2 OH(CHOH) n CH 2 OH, where n is an integer from 1 to 6. Preferably the polyhydric alcohol is sorbitol, and in a preferred embodiment a moderator is the form of a thio glycerol is present.
Inventors
- 👤 Harry Bahls
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:23
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/31; C23C18/42; C23C18/44
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
103 words
In a method of applying a coating of metallic silver to the surface of a substrate, wherein a silver solution containing reducible dissolved silver in the presence of an alkali metal hydroxide and ammonia is applied to the surface of said substrate, the improvement which comprises concurrently applying to the surface of said substrate and mixing in situ with said silver solution a separate aqueous solution of a moderating reducer comprising about 5 to 35%, by weight of the water, of a polyhydric alcohol of the formula CH 2 OH(CHOH) n CH 2 OH where n is an integer from 1 to 6.
Claim 2
Dependent Claim
103 words
In a method of applying a coating of metallic silver to the surface of a substrate, wherein a silver solution containing reducible dissolved silver in the presence of an alkali metal hydroxide and ammonia is applied to the surface of said substrate, the improvement which comprises concurrently applying to the surface of said substrate and mixing in situ with said silver solution a separate aqueous solution of a moderating reducer comprising about 5 to 35%, by weight of the water, of a polyhydric alcohol of the formula CH 2 OH(CHOH) n CH 2 OH where n is an integer from 1 to 6.
Claim 3
Dependent Claim
39 words
The method defined in claim 1, wherein said alcohol is selected from the group consisting of erythritol, threitol, arabinitol, ribitol, xylitol, allitol, galactitol, glucitol, sorbitol, iditol, mannitol, altritol, volemitol, glycero-altro hepitol, erythro-galacto octitol and dextro and laevo isomers thereof.
Claim 4
Dependent Claim
12 words
The method defined in claim 1, wherein said polyhydric alcohol is sorbitol.
Claim 5
Dependent Claim
41 words
The method defined in claim 1, wherein a moderator is concurrently applied to said substrate surface, said moderator comprising a thio compound of the formula CH 2 OH--(CHOH) m --CH 2 SH where m is an integer from 0 to 1.
Claim 6
Dependent Claim
13 words
The method defined in claim 4, wherein said thio compound is 1-thio glycerol.
Claim 7
Dependent Claim
12 words
The method defined in claim 5, wherein said polyhydric alcohol is sorbitol.
Claim 8
Dependent Claim
11 words
The method defined in claim 1, wherein said substrate is glass.
Claim 9
Dependent Claim
52 words
The method defined in claim 1, wherein said dissolved silver, said hydroxide and said ammonia are mixed together before being applied as a mixture to said substrate, and wherein said polyhydric alcohol is separately applied at substantially the same location upon said substrate as the location to which said mixture is applied.
Claim 10
Dependent Claim
77 words
The method defined in claim 1, wherein said dissolved silver and said ammonia are mixed to form a solution (A) separately applied to said substrate, wherein a solution (B) of ammonia and said hydroxide is separately applied to said substrate, and wherein said reducer solution (C) comprising polyhydric alcohol is also separately applied to said substrate, all solutions (A), (B), and (C) being substantially concurrently applied at substantially the same location on the surface of said substrate.
Claim 11
Dependent Claim
25 words
The method defined in claim 1, wherein said reducer solution also contains about 5 to 15 ml of formaldehyde per pound of said polyhydric alcohol.
Claim 12
Dependent Claim
11 words
The method defined in claim 1, wherein said substrate is plastic.
Claim 13
Dependent Claim
11 words
The method defined in claim 1, wherein said substrate is ceramic.
Claim 14
Dependent Claim
89 words
In a method of modifying the silver reduction reaction in the electroless deposition of metallic silver as a film upon a substrate, wherein said silver is present in aqueous solution as a silver diammine and is applied continuously to a moving substrate, the step which comprises concurrently applying to the surface of said moving substrate and mixing with said aqueous silver diammine solution an aqueous solution of a polyhydric alcohol of the formula CH 2 OH(CHOH) n CH 2 OH wherein n is an integer from 1 to 6.
Claim 15
Dependent Claim
89 words
In a method of modifying the silver reduction reaction in the electroless deposition of metallic silver as a film upon a substrate, wherein said silver is present in aqueous solution as a silver diammine and is applied continuously to a moving substrate, the step which comprises concurrently applying to the surface of said moving substrate and mixing with said aqueous silver diammine solution an aqueous solution of a polyhydric alcohol of the formula CH 2 OH(CHOH) n CH 2 OH wherein n is an integer from 1 to 6.
Claim 16
Dependent Claim
14 words
The method defined in claim 13, wherein said alcohol is defined in claim 2.
Claim 17
Dependent Claim
11 words
The method defined in claim 13, wherein said alcohol is sorbitol.
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) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |