US3849190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dielectric glass overlays and method for producing said glass compositions
Assignee: International Business Machines Corp
•
Filing: 1973-04-20
•
Granted: 1974-11-19
•
Expires: 1993-04-20
Abstract
Abstract A method for the production of dielectric glass compositions useful in a gas panel or plasma display device apparatus is disclosed. The method comprises providing a supported glass substrate and sequentially depositing thereon firstly a glass frit of appropriate particle size having compatible thermal expansion properties with said glass substrate and capable of forming into clear substantially bubble-free films at a temperature equal to or less than 620*C. Secondly, depositing thereon a layer of glass frit having a viscosity higher than said first deposited glass frit, having a maximum softening temperature of 620*C, followed by firing said deposited composite frit layers to a temperature of approximately 620*C in an atmosphere of nitrogen, air or oxygen.
Inventors
- 👤 B Foster
- 👤 R Tummala
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:25
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/34; C03C17/3411; H; H01; H01B; H01B3/00; H01B3/02; H01B3/08; H01J; H01J11/00; H01J11/10; H01J11/12; H01J65/00; H01J65/04; H01J9/00; H01J9/24; H01J9/241; H01J9/245; H01J2211/00; H01J2211/20; H01J2211/34; H01J2211/38
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
188 words
IN A METHOD FOR FABRICATING A GAS PANEL DISPLAY CELL ARRAY STRUCTURE HAVING AT LEAST ONE GLASS SUBSTRATE HAVING A PLANAR SURFACE WITH ELECTRICALLY CONDUCTIVE METAL CONTACTS THEREON AND A DIELECTRIC COMPOSITE GLASS MATERIAL OVERLYING SAID PLANAR SURFACE AND SAID ELECTRICALLY CONDUCTIVE METAL CONTACTS, AND WHEREIN THE IMPROVEMENT IN SAID METHOD COMPRISES THE FOLLOWING STEPS IN THE ORDER RECITED: A. COATING SAID PLANAR SURFACE OF SAID GLASS SUBSTRATE WITH SAID ELECTRICALLY CONDUCTIVE METAL CONTACTS THEREON WITH A FIRST SLURRY CONTAINING AN ORGANIC DISPERSION MEDIUM AND A FIRST GLASS FRIT; B. COATING SAID PLANAR SURFACE OF SAID GLASS SUBSTRATE WITH SAID ELECTRICALLY CONDUCTIVE METAL CONTACTS THEREON AND COATED WITH SAID FIRST SLURRY CONTAINING SAID FIRST GLASS FRIT WITH A SECOND SLURRY CONTAINING AN ORGANIC DISPERSION MEDIUM AND A SECOND FIRST FRIT WHERE SAID SECOND GLASS FRIT HAS A HIGHER SOFTENING TEMPERATURE AND VISCOSITY THAN SAID FIRST GLASS FRIT; C. GRADUALLY HEATING SAID COATINGS IN AN ATMOSPHERE SELECTED FROM THE GROUP CONSISTING OF NITROGEN, OXYGEN AND AIR O A TEMPERATURE APPROXIMATELY EQUAL TO THE SOFENTING TEMPERATURE OF SAID GLASS SUBSTRATE TO EVAPORATE SAID ORGANIC DISPERSION MEDIUMS THEREBY FORMING DRY COATINGS;
Claim 2
Dependent Claim
188 words
IN A METHOD FOR FABRICATING A GAS PANEL DISPLAY CELL ARRAY STRUCTURE HAVING AT LEAST ONE GLASS SUBSTRATE HAVING A PLANAR SURFACE WITH ELECTRICALLY CONDUCTIVE METAL CONTACTS THEREON AND A DIELECTRIC COMPOSITE GLASS MATERIAL OVERLYING SAID PLANAR SURFACE AND SAID ELECTRICALLY CONDUCTIVE METAL CONTACTS, AND WHEREIN THE IMPROVEMENT IN SAID METHOD COMPRISES THE FOLLOWING STEPS IN THE ORDER RECITED: A. COATING SAID PLANAR SURFACE OF SAID GLASS SUBSTRATE WITH SAID ELECTRICALLY CONDUCTIVE METAL CONTACTS THEREON WITH A FIRST SLURRY CONTAINING AN ORGANIC DISPERSION MEDIUM AND A FIRST GLASS FRIT; B. COATING SAID PLANAR SURFACE OF SAID GLASS SUBSTRATE WITH SAID ELECTRICALLY CONDUCTIVE METAL CONTACTS THEREON AND COATED WITH SAID FIRST SLURRY CONTAINING SAID FIRST GLASS FRIT WITH A SECOND SLURRY CONTAINING AN ORGANIC DISPERSION MEDIUM AND A SECOND FIRST FRIT WHERE SAID SECOND GLASS FRIT HAS A HIGHER SOFTENING TEMPERATURE AND VISCOSITY THAN SAID FIRST GLASS FRIT; C. GRADUALLY HEATING SAID COATINGS IN AN ATMOSPHERE SELECTED FROM THE GROUP CONSISTING OF NITROGEN, OXYGEN AND AIR O A TEMPERATURE APPROXIMATELY EQUAL TO THE SOFENTING TEMPERATURE OF SAID GLASS SUBSTRATE TO EVAPORATE SAID ORGANIC DISPERSION MEDIUMS THEREBY FORMING DRY COATINGS;
Claim 3
Dependent Claim
27 words
In a method for fabricating a gas panel display cell array structure in accordance with claim 1 wherein said glass substrate is a soda lime silica glass.
Claim 4
Dependent Claim
35 words
In a method for fabricating a gas panel display cell array structure in accordance with claim 1 wherein said first glass frit is a lead glass and said second glass frit is a non-lead glass.
Claim 5
Dependent Claim
28 words
In a method for fabricating a gas panel display cell array structure in accordance with claim 1 wherein said first and second glass frits are respectively lead glasses.
Claim 6
Dependent Claim
45 words
In a method for fabricating a gas panel display cell array structure in accordance with claim 1 wherein said glass substrate is a soda lime silicon glass having approximately 14 percent by weight Na2O, 10 percent by weight CaO, and 75 percent by weight SiO2.
Claim 7
Dependent Claim
195 words
In a method for fabricating a gas panel display cell array wherein the improvement in said method comprises the following steps in the order recited: a. forming a soda lime silica glass substrate having at least one planar surface; b. forming an electrically conductive thin metal pattern on said planar surface; c. depositing a first layer of a slurry containing an organic dispersion medium and a first lead glass frit on said planar surface containing said electrically conductive thin metal pattern; d. depositing a second layer of a slurry containing an organic dispersion medium and a second glass frit on said first layer, and where said second glass frit has a higher softening temperature and viscosity than said first glass frit; e. gradually heating said layers in an atmosphere selected from the group consisting of nitrogen, oxygen and air to a temperature of between 595*C and 620*C to evaporate said organic dispersion mediums thereby forming dry coatings; f. maintaining said layers at said temperature for a period of one-half to 2 hours to form a composite having an integrally diffused interface of two distinct glass compositions: g. and, gradually cooling said layers to room temperature.
Claim 8
Dependent Claim
195 words
In a method for fabricating a gas panel display cell array wherein the improvement in said method comprises the following steps in the order recited: a. forming a soda lime silica glass substrate having at least one planar surface; b. forming an electrically conductive thin metal pattern on said planar surface; c. depositing a first layer of a slurry containing an organic dispersion medium and a first lead glass frit on said planar surface containing said electrically conductive thin metal pattern; d. depositing a second layer of a slurry containing an organic dispersion medium and a second glass frit on said first layer, and where said second glass frit has a higher softening temperature and viscosity than said first glass frit; e. gradually heating said layers in an atmosphere selected from the group consisting of nitrogen, oxygen and air to a temperature of between 595*C and 620*C to evaporate said organic dispersion mediums thereby forming dry coatings; f. maintaining said layers at said temperature for a period of one-half to 2 hours to form a composite having an integrally diffused interface of two distinct glass compositions: g. and, gradually cooling said layers to room temperature.
Claim 9
Dependent Claim
78 words
In a method for fabricating a gas panel display cell array in accordance with claim 6 wherein said deposited layers containing glass frits are first heated to dryness, followed by heating to about 500*C at a rate of 1.5*C per minute, followed by heating to 615*C at a rate of 1*C per minute, followed by holding at said temperature of 615*C for a period of approximately 2 hours, and followed by cooling at reverse rates to room temperature.
Claim 10
Dependent Claim
86 words
IN A GLASS PANEL DISPLAY CELL ARRAY STURCTURE, A SODA LIME SILICA GLASS SUBSTRATE HAVING AT LEAST ONE PLANAR SURFACE AND ELECTRICALLY CONDUCTIVE METAL CONTACTS ON SAID PLANAR SURFACE OF SAID SUBSTRATE, WHEREIN THE IMPROVEMENT COMPRISES: A DIELECTRIC GLASS OVERLAY SAID CONTACTS SAID PLANAR SURFACE OF SAID GLASS SUBSTRATE, SAID DIELECTRIC GLASS OVERLAY COMPRISING FIRST AND SECOND GLASS COMPOSITIONS HAVING A DIFFUSED INTERFACE, SAID FIRST GLASS COMPOSITION CONSISTING ESSENTIALLY OF ANY ONE OF THE COMPOSITION A, B AND C, AS SET FORTH IN THE FOLLOWING TABLE:
Claim 11
Dependent Claim
86 words
IN A GLASS PANEL DISPLAY CELL ARRAY STURCTURE, A SODA LIME SILICA GLASS SUBSTRATE HAVING AT LEAST ONE PLANAR SURFACE AND ELECTRICALLY CONDUCTIVE METAL CONTACTS ON SAID PLANAR SURFACE OF SAID SUBSTRATE, WHEREIN THE IMPROVEMENT COMPRISES: A DIELECTRIC GLASS OVERLAY SAID CONTACTS SAID PLANAR SURFACE OF SAID GLASS SUBSTRATE, SAID DIELECTRIC GLASS OVERLAY COMPRISING FIRST AND SECOND GLASS COMPOSITIONS HAVING A DIFFUSED INTERFACE, SAID FIRST GLASS COMPOSITION CONSISTING ESSENTIALLY OF ANY ONE OF THE COMPOSITION A, B AND C, AS SET FORTH IN THE FOLLOWING TABLE:
Claim 12
Dependent Claim
25 words
In a gas panel display cell array structure in accordance with claim 8 wherein a protective alkaline earth metal overlay overlies said dielectric glass overlay.
Claim 13
Dependent Claim
23 words
In a gas panel display cell array structure in accordance with claim 9 wherein a said protective earth metal overlay is magnesium oxide.
Claim 14
Dependent Claim
59 words
In a gas panel display cell array structure as recited in claim 8 wherein said first glass composition consists essentially of one or more of the compositions A, B and C as recited in claim 8, and said second glass compositions consists essentially of one or more of the compositions D, E and F as recited in claim 8.
Claim 15
Dependent Claim
92 words
In a method for fabricating a gas panel display cell array wherein the improvement in said method comprises the following steps in the order recited: a. forming a soda lime silica glass substrate having at least one planar surface; b. forming electrically conductive metal contacts on said planar surface; c. coating said planar surface having said metal contacts thereon with a slurry containing an organic dispersion medium and a first glass frit composition consisting essentially of any one of the compositions A, B or C as set forth in the following Table:
Claim 16
Dependent Claim
92 words
In a method for fabricating a gas panel display cell array wherein the improvement in said method comprises the following steps in the order recited: a. forming a soda lime silica glass substrate having at least one planar surface; b. forming electrically conductive metal contacts on said planar surface; c. coating said planar surface having said metal contacts thereon with a slurry containing an organic dispersion medium and a first glass frit composition consisting essentially of any one of the compositions A, B or C as set forth in the following Table:
Claim 17
Dependent Claim
64 words
In a method for fabricating a gas panel display cell array in accordance with claim 12 wherein said first glass frit composition consists essentially of one or more of the compositions A, B and C as recited in claim 12, and said second glass frit composition consists essentially of one or more of the compositions D, E and F as recited in claim 12.
References Cited (Backward Citations)
US2877144A
Cited
US3039888A
Cited
US3384508A
Cited
US3484266A
Cited
US3666981A
Cited
US3716742A
Cited
US3788874A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |