US3802907A
Expired / Lapsed
US
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Metallizing process
Assignee: Bayer Pharma AG
•
Filing: 1971-01-29
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Granted: 1974-04-09
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Expires: 1991-01-29
Abstract
Abstract Silicic acid and electrolessly deposited metal are deposited on a glass or ceramic body in any order, even simultaneously. Then the body is heat treated to increase the adherence of the silicic acid and metal to the body. Additional metal can then be galvanically deposited onto the electrolessly deposited metal. The metal adherence is greatly improved over that obtained by previous techniques for metallizing glass or ceramic bodies.
Inventors
- 👤 R Apfelbach
- 👤 A Jostan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:43
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/34; C03C17/36; C03C17/3602; C03C17/3605; C03C17/3607; C03C17/3613; C03C17/3642; C03C17/3697; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/52; C04B41/80; C04B41/81; C04B41/89; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/1851; C23C18/1862; C23C18/1865; C23C18/1872; C23C18/1886; C23C18/1893; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; H05K3/00; H05K3/10; H05K3/18; H05K3/181; H05K3/38
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
25 words
A process as claimed in claim 1, wherein the step of depositing silicic acid includes contacting said body with an aqueous solution of alkali silicate.
Claim 2
Dependent Claim
37 words
A process as claimed in claim 1, wherein a substance selected from the group consisting of silicic acid and soluble silicates is added to a electroless metallizing bath, whereby both steps of depositing are carried out simultaneously.
Claim 3
Dependent Claim
20 words
A process as claimed in claim 3, wherein said substance is selected from the group consisting of the alkali silicates.
Claim 4
Dependent Claim
13 words
A process as claimed in claim 4, wherein said substance is water glass.
Claim 5
Dependent Claim
23 words
A process as claimed in claim 1, wherein the step of depositing silicic acid is carried out before the step of depositing metal.
Claim 6
Dependent Claim
185 words
A process as claimed in claim 6, wherein said body is Al2O3; wherein the step of depositing silicic acid comprises the steps of cleaning the body in chromosulfuric acid, then immersing the body in a 20 to 25 weight percent sodium water glass solution, then pulling the body out of the water glass solution with a speed of 0.2 to 0.5 millimeters per second, then drying the body at a maximum temperature of 35*C for about 30 minutes, and then rinsing the body in water; wherein the step of depositing metal comprises the steps of sensitizing the body in a solution containing 10 to 40 grams per liter SnCl2.2H2O and about 40 milliliters per liter concentrated HCl, then activating the body in a solution containing about 0.3 grams per liter PdCl2 and about 3 milliliters per liter concentrated HCl, and then immersing the body in a electroless metallizing bath for providing a metal film of thickness 0.5 to 0.8 Mu m; and wherein the step of heat treating comprises holding the body at 500* to 600*C for 4.5 to 6 minutes under a protective atmosphere.
Claim 7
Dependent Claim
13 words
A process as claimed in claim 7, wherein said protective atmosphere is nitrogen.
Claim 8
Dependent Claim
62 words
A process as claimed in claim 6, wherein the step of electrolessly depositing metal comprises sensitizing and activating said body and then placing said body in a solution means for producing a deposit of said metal from ions of said metal by the action of a means for reducing said ions, and wherein the body is heated for 4.5 to 6 minutes.
Claim 9
Dependent Claim
23 words
A process as claimed in claim 1, wherein the step of depositing silicic acid is carried out during the step of depositing metal.
Claim 10
Dependent Claim
23 words
A process as claimed in claim 1, wherein the step of depositing silicic acid is carried out after the step of depositing metal.
Claim 11
Dependent Claim
68 words
A process as claimed in claim 1, wherein the step of electrolessly depositing the metal film comprises sensitizing and activating said body and then placing said body in a solution means for producing a deposit of said metal from ions of said metal by the action of a means for reducing said ions, and wherein the body is heated at 500* to 600*C for 4.5 to 6 minutes.
Claim 12
Dependent Claim
99 words
A process for metallizing a glass or ceramic body comprising the steps of electrolessly depositing, as one material, a thin film of metal on said body, immersing the body in an aqueous solution of a water soluble compound of SiO2, slowly removing the body from the solution for allowing retention of material from said solution, as another material, on the body, and heat treating the body at 500* - 600*C in a protective atmosphere for increasing the adherence of said materials to the body whereby the electrolessly deposited metal film is amenable to build-up by galvanic deposition of metal.
Claim 13
Dependent Claim
23 words
A process as claimed in claim 13, wherein the steps of immersing and removing are carried out before the step of depositing metal.
Claim 14
Dependent Claim
62 words
A process as claimed in claim 14, wherein the step of electrolessly depositing metal comprises sensitizing and activating said body and then placing said body in a solution means for producing a deposit of said metal from ions of said metal by the action of a means for reducing said ions, and wherein the body is heated for 4.5 to 6 minutes.
Claim 15
Dependent Claim
23 words
A process as claimed in claim 13, wherein the steps of immersing and removing are carried out during the step of depositing metal.
Claim 16
Dependent Claim
23 words
A process as claimed in claim 13, wherein the steps of immersing and removing are carried out after the step of depositing metal.
Claim 17
Dependent Claim
62 words
A process as claimed in claim 13, wherein the step of electrolessly depositing metal comprises sensitizing and activating said body and then placing said body in a solution means for producing a deposit of said metal from ions of said metal by the action of a means for reducing said ions, and wherein the body is heated for 4.5 to 6 minutes.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-08 | 1977-10-08 | 1978-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-08 | 1981-10-08 | 1982-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-08 | 1985-10-08 | 1986-04-09 | $7700.00 | Window Closed / Lapsed |