US4547467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dielectric composition and devices using it
Assignee: Unisys Corp
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Filing: 1983-06-22
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Granted: 1985-10-15
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Expires: 2003-06-22
Abstract
Abstract A composition for a dielectric ink used in a screening process including a lead-free glass frit binder, silica, and a vehicle. The dielectric composition is particularly suited for use in gas plasma display panels.
Inventors
- 👤 Edward G. Barth
- 👤 Ruvim Braude
- 👤 Nicholas W. Kay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:45
CPC Classifications
H; H01; H01J; H01J11/00; C; C03; C03C; C03C8/00; C03C8/02; C03C8/04; H01B; H01B3/00; H01B3/02; H01B3/08; H01B3/085; H01B3/087; H01J17/00; H01J17/38; H01J17/48; H01J17/49
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
104 words
A dielectric ink composition for forming thick film dielectric layers comprising a lead-free glass frit binder, silica, a pigment, and a vehicle, said glass frit having a composition including about 20% by weight of SiO 2 , about 20% by weight of B 2 O 3 , about 3% by weight of CaO, about 40% by weight of ZnO, about 5% by weight of Al 2 O 3 , about 7% by weight of Na 2 O, about 4% by weight of K 2 O, and about 1% by weight of Li 2 O, said ink composition being fireable at temperatures below 600° C.
Claim 2
Dependent Claim
104 words
A dielectric ink composition for forming thick film dielectric layers comprising a lead-free glass frit binder, silica, a pigment, and a vehicle, said glass frit having a composition including about 20% by weight of SiO 2 , about 20% by weight of B 2 O 3 , about 3% by weight of CaO, about 40% by weight of ZnO, about 5% by weight of Al 2 O 3 , about 7% by weight of Na 2 O, about 4% by weight of K 2 O, and about 1% by weight of Li 2 O, said ink composition being fireable at temperatures below 600° C.
Claim 3
Dependent Claim
23 words
The ink defined in claim 1 wherein said silica includes a quantity of an amorphous silica and a quantity of arc processed silica.
Claim 4
Dependent Claim
16 words
The ink defined in claim 1 wherein said vehicle includes ethyl cellulose and various organic solvents.
Claim 5
Dependent Claim
37 words
The ink defined in claim 2 wherein said amorphous silica has a particle size of about ten microns and said arc processed silica has a particle size in the range of about 0.2 to about one micron.
Claim 6
Dependent Claim
15 words
The ink defined in claim 3 wherein said pigment is an iron chromite black spinel.
Claim 7
Dependent Claim
25 words
The ink defined in claim 3 wherein said pigment is an iron chromite black spinel having a particle size of about 3 to 5 microns.
Claim 8
Dependent Claim
33 words
The ink defined in claim 1 wherein the glass frit binder is present in about 17 weight percent, the silica is present in about 18 weight percent, with the remainder being the vehicle.
Claim 9
Dependent Claim
19 words
The ink defined in claim 7 wherein said vehicle includes ethyl cellulose and various organic solvents including alpha terpineol.
References Cited (Backward Citations)
US3046433A
Cited
US2918383A
Cited
US3561989A
Cited
US4323652A
Cited
US4392180A
Cited
US4369254A
Cited
US4446059A
Cited
US4496875A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-14 | 1989-04-15 | 1989-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-14 | 1993-04-15 | 1993-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-14 | 1997-04-15 | 1997-10-15 | $7700.00 | Window Closed / Lapsed |