Patent US4619838A successfully refreshed from Google Patents.
US4619838A
Expired / Lapsed
US
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Process for the deposition of metals on semiconductor powders
Assignee: Novartis Corp
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Filing: 1985-09-26
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Granted: 1986-10-28
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Expires: 2005-09-26
Abstract
Abstract Copper, lead, mercury, tin, gold, silver, palladium, osmium and/or cadmium can be deposited by photoredox reaction on semiconductor sulfide powders by irradiating a suspension of semiconductor sulfide powder in the presence of oxygen and optionally CO 2 , of an oxidizable system which optionally protects the semiconductor from photocorrosion, and of a salt or complex of copper, lead, mercury, tin, gold, silver, palladium, osmium and/or cadmium.
Inventors
- 👤 Kurt Meier
- 👤 Niklaus Buhler
- 👤 Jean-Francois Reber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:23
CPC Classifications
C; C22; C22B; C22B13/00; C22B13/04; C22B11/00; C22B11/04; C22B15/00; C22B15/0063; C22B15/0084; C22B15/0086; C22B17/00; C22B17/04; C22B25/00; C22B25/06; C22B43/00; C22B9/00; C22B9/16; C22B9/22; C22B9/221; C22B9/225; C23; C23C; C23C18/00; C23C18/14; C23C18/143; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
88 words
A process for the deposition of copper, lead, mercury, tin, gold, silver, palladium, osmium, cadmium or mixtures thereof on a semiconductor sulfide powder selected from the group consisting of Zns and Bi 2 S 3 , which process comprises irradiating a suspension of said semiconductor powder in an open system, in the presence of oxygen, CO 2 or mixtures thereof, of an oxidizable medium, which protects the semiconductor from photocorrosion, and of a copper, lead, mercury, tin, gold, silver, palladium, osmium, cadmium salt or complex, or mixture thereof.
Claim 2
Dependent Claim
88 words
A process for the deposition of copper, lead, mercury, tin, gold, silver, palladium, osmium, cadmium or mixtures thereof on a semiconductor sulfide powder selected from the group consisting of Zns and Bi 2 S 3 , which process comprises irradiating a suspension of said semiconductor powder in an open system, in the presence of oxygen, CO 2 or mixtures thereof, of an oxidizable medium, which protects the semiconductor from photocorrosion, and of a copper, lead, mercury, tin, gold, silver, palladium, osmium, cadmium salt or complex, or mixture thereof.
Claim 3
Dependent Claim
26 words
A process according to claim 1 wherein the semiconductor powder is present in an amount of 0.05 to 5 grams per 100 ml of reaction volume.
Claim 4
Dependent Claim
26 words
A process according to claim 1 wherein the semiconductor powder is present in an amount of 0.1 to 2 grams per 100 ml of reaction volume.
Claim 5
Dependent Claim
45 words
A process according to claim 1 for the deposition of gold, silver, palladium, osmium, cadmium or mixture of thereof on semiconductor powders, wherein the irradiation is carried out in the presence of a salt or complex of gold, silver, palladium, osmium, cadmium or mixtures thereof.
Claim 6
Dependent Claim
53 words
A process according to claim 1, wherein the oxidisable medium consists of water, alkanols containing up to 6 carbon atoms, mixtures of water and alkanols containing up to 6 carbon atoms, mixtures of water and alkali metal sulfites or sulfides, alkaline earth metal sulfites or sulfides, or ammonium sulfites or sulfides, or acetate.
Claim 7
Dependent Claim
23 words
A process according to claim 1, wherein the reaction is carried out in water or in water containing acetate buffer or sodium sulfite.
Claim 8
Dependent Claim
11 words
A process according to claim 1, wherein ZnS powder is used.
Claim 9
Dependent Claim
27 words
A process according to claim 1, wherein the oxidisable system is not water if ZnS, or Bi 2 S 3 , FeTiO 3 or powder is used.
Claim 10
Dependent Claim
20 words
A process according to claim 1, wherein the reaction medium contains a salt or a complex of palladium or cadmium.
Claim 11
Dependent Claim
18 words
A process according to claim 1, wherein the reaction medium contains a salt or a complex of silver.
Claim 12
Dependent Claim
20 words
A process according to claim 1, wherein irradiation is carried out with sunlight or with a mercury high pressure lamp.
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) | 1989-10-27 | 1990-04-28 | 1990-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-27 | 1994-04-28 | 1994-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-27 | 1998-04-28 | 1998-10-28 | $7700.00 | Window Closed / Lapsed |