US3900305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming conductive layer on oxide-containing surfaces
Assignee: Corning Glass Works
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Filing: 1973-05-07
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Granted: 1975-08-19
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Expires: 1993-05-07
Abstract
Abstract Disclosed is a method of forming a conductive layer on an oxidecontaining ceramic substrate. The substrate is disposed in an essentially oxygen-free atmosphere and is heated to a temperature greater than 300*C. but less than the softening or deforming point of the substrate. The surface of the heated substrate is subjected to magnesium vapor, and the resultant reaction reduces the substrate surface and forms a conductive cermet layer thereon. This method can be used to form conductive layers and paths in such devices as resistors, channel amplifier arrays, multilead arrays, cathode ray tubes, and the like.
Inventors
- 👤 Robert D Deluca
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:22
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/10; H05K3/105; C; C03; C03C; C03C17/00; C03C17/06; C03C17/09; H01; H01B; H01B1/00; H01J; H01J43/00; H01J43/04; H01J43/06; H01J43/18; H01J43/24; H01J9/00; H05K2203/00; H05K2203/11; H05K2203/1105; H05K2203/12; H05K2203/125
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
98 words
A METHOD OF FORMING A CONDUCTIVE LAYER ON A SURFACE OF AN OXIDE-CONTAINING CERAMIC SUBSTRATE COMPRISING THE STEPS OF PROVIDING A SUBSTRATE OF OXIDE-CONTAINING CERAMIC MATERIAL THAT IS CAPABLE OF BEING REDUCED BY MAGNESIUM VAPOR AT TEMPERATURES IN EXCESS OF 300*C, SAID CERAMIC MATERIAL BEING SELECTED FROM THE GROUP CONSISTING OF SINTERABLE CERAMICS, GLASSES AND GLASS-CERAMICS. DISPOSING SAID SUBSTRATE IN A REACTION CHAMBER HAVING A VACUUM SYSTEM CONNECTED THERETO FOR MAINTANING THE PRESSURE IN SAID CHAMBER AT 10**-4 TORR OR LESS, HEATING SAID SUBSTRATE TO A TEMPERATURE GREATER THAN 300*C BUT LESS THAN THE DEFORMING TEMPERATURE THEREOF, AND
Claim 2
Independent Claim
98 words
A METHOD OF FORMING A CONDUCTIVE LAYER ON A SURFACE OF AN OXIDE-CONTAINING CERAMIC SUBSTRATE COMPRISING THE STEPS OF PROVIDING A SUBSTRATE OF OXIDE-CONTAINING CERAMIC MATERIAL THAT IS CAPABLE OF BEING REDUCED BY MAGNESIUM VAPOR AT TEMPERATURES IN EXCESS OF 300*C, SAID CERAMIC MATERIAL BEING SELECTED FROM THE GROUP CONSISTING OF SINTERABLE CERAMICS, GLASSES AND GLASS-CERAMICS. DISPOSING SAID SUBSTRATE IN A REACTION CHAMBER HAVING A VACUUM SYSTEM CONNECTED THERETO FOR MAINTANING THE PRESSURE IN SAID CHAMBER AT 10**-4 TORR OR LESS, HEATING SAID SUBSTRATE TO A TEMPERATURE GREATER THAN 300*C BUT LESS THAN THE DEFORMING TEMPERATURE THEREOF, AND
Claim 3
Dependent Claim
50 words
A method in accordance with claim 1 wherein the step of providing a substrate comprises providing a body consisting of glass, wherein the vapor pressure of magnesium in said chamber is at least one hundred times the oxygen pressure therein, and wherein said substrate is heated to at least 450*C.
Claim 4
Dependent Claim
39 words
A method in accordance with claim 1 wherein the step of providing said chamber with a source of magnesium vapor comprises disposing a source of metallic magnesium in said reaction chamber and heating said magnesium to at least 400*C.
Claim 5
Dependent Claim
52 words
A method in accordance with claim 1 wherein the step of providing said chamber with a source of magnesium vapor comprises providing a source of metallic magnesium remote from said reaction chamber, heating said magnesium to at least 400*C. to generate magnesium vapor, and flowing said magnesium vapor into said reaction chamber.
Claim 6
Dependent Claim
64 words
A method in accordance with claim 1 wherein the step of providing a substrate comprises providing a glass body having a plurality of parallel channels therethrough and the step of providing said chamber with a source of magnesium vapor comprises directing a flow of magnesium vapor into said channels, thereby reducing the channel forming surfaces of said body and forming a conductive cermet thereon.
Claim 7
Dependent Claim
49 words
A method in accordance with claim 1 wherein the step of providing a substrate comprises providing a glass body having a plurality of parallel apertures therethrough, and the step of providing said chamber with a source of magnesium vapor comprises directing a flow of magnesium vapor into said apertures.
Claim 8
Dependent Claim
143 words
A method in accordance with claim 1 wherein the step of providing comprises providing a substrate a plurality of rods of easily reduced glass, each of said rods being disposed within a tube of glass that is not as easily reduced as said glass rods, said tubes being disposed in side-by-side relation to form a stacked assembly, the step of heating comprises heating said assembly to a temperature sufficient to cause magnesium vapor to reduce the surfaces of said rods but insufficient to cause magnesium vapor to reduce the surfaces of said tubes, and the step of reacting comprises flowing magnesium vapor into said tubes to reduce the surfaces of said rods and form a conductive cermet thereon, said method further comprising the step of applying pressure to said assembly at an elevated temperature to cause said tubes to collapse upon said rods.
Claim 9
Dependent Claim
50 words
A method in accordance with claim 1 wherein the step of providing a substrate comprises providing a glass cathode ray tube funnel and the step of reacting comprises disposing a source of metallic magnesium adjacent to an opening in said funnel and heating said magnesium source to at least 600*C.
Claim 10
Dependent Claim
39 words
A method in accordance with claim 2 wherein the step of disposing comprises disposing said substrate in a reaction chamber having a vacuum system connected thereto for reducing the pressure in said chamber to 10 6 Torr or less.
Claim 11
Dependent Claim
27 words
A method in accordance with claim 3 wherein the temperature to which said magnesium is heated is different from the temperature to which said substrate is heated.
Claim 12
Dependent Claim
114 words
A method in accordance with claim 6 wherein the step of providing a glass body having a plurality of apertures therethrough comprises pRoviding a stacked array of tubes of a first glass, each tube having disposed therein a rod of a second glass that is more easily reduced than said first glass, the cross-sectional shape of said rods and said tubes being different so that aperture forming spaces exist between said rods and said tubes, the step of heating comprises heating said stacked array to a temperature sufficient to cause said magnesium vapor to reduce the surfaces of said rods but insufficient to cause said magnesium vapor to reduce the surfaces of said tubes.
Claim 13
Independent Claim
136 words
A method of forming a conductive layer on a surface of an oxide-containing ceramic substrate comprising the steps of providing an oxide-containing ceramic substrate consisting of a material that is capable of being reduced by magnesium vapor at temperatures in excess of 300*C, said ceramic material being selected from the group consisting of sinterable ceramics, glasses and glass-ceramics, providing a reaction chamber having a vacuum system connected thereto for maintaining the pressure in said chamber at 10 4 Torr or less, providing said chamber with a source of magnesium vapor, disposing said substrate in said chamber between said source of magnesium vapor and the point of connection of said vacuum system so that magnesium vapor flows onto said substrate, and heating said substrate to a temperature greater than 300*C but less than the deforming temperature thereof.
Claim 14
Independent Claim
136 words
A method of forming a conductive layer on a surface of an oxide-containing ceramic substrate comprising the steps of providing an oxide-containing ceramic substrate consisting of a material that is capable of being reduced by magnesium vapor at temperatures in excess of 300*C, said ceramic material being selected from the group consisting of sinterable ceramics, glasses and glass-ceramics, providing a reaction chamber having a vacuum system connected thereto for maintaining the pressure in said chamber at 10 4 Torr or less, providing said chamber with a source of magnesium vapor, disposing said substrate in said chamber between said source of magnesium vapor and the point of connection of said vacuum system so that magnesium vapor flows onto said substrate, and heating said substrate to a temperature greater than 300*C but less than the deforming temperature thereof.
Claim 15
Dependent Claim
45 words
A method in accordance with claim 12 further comprising the step of providing a baffle having an aperture therein, and disposing said baffle in said chamber between said source of magnesium vapor and said substrate to direct the flow of magnesium vapor onto said substrate.
Claim 16
Dependent Claim
48 words
A method in accordance with claim 12 wherein the step of providing said chamber with a source of magnesium vapor comprises disposing a source of metallic magnesium in said reaction chamber and heating said magnesium to at least 400*C., and said substrate is heated to at least 450*C.
Claim 17
Dependent Claim
50 words
A method in accordance with claim 13 wherein the step of providing a substrate comprises providing a hollow glass article and the step of disposing said substrate in said chamber comprises disposing said substrate on said baffle so that the hollow portion of said substrate is disposed over said aperture.
Claim 18
Dependent Claim
27 words
A method in accordance with claim 15 wherein the temperature to which said magnesium is heated is different from the temperature to which said substrate is heated.
References Cited (Backward Citations)
US2104073A
Cited
US3012902A
Cited
US3241934A
Cited
US3253331A
Cited
US3331670A
Cited
US3472688A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |