US3955023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Black dielectric mask on white substrate
Assignee: Texas Instruments Inc
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Filing: 1974-11-01
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Granted: 1976-05-04
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Expires: 1994-11-01
Abstract
Abstract An improved method is provided for applying a dark dielectric surface to a white substrate as used in headers for light emitting diode displays. Light reflectance is reduced without degrading the insulating properties of the dielectric. A paste comprising fine grain alumina and up to 20% by weight of an oxide or metal powder of either molybdenum or tungsten is applied to an alumina substrate. The substrate is then subjected to a reducing atmosphere, wherein the molybdenum or tungsten material is reduced to a black color. The resulting metal phase forms a dielectric layer of low light reflectance without impairing the insulating properties of the dielectric.
Inventors
- 👤 John Alexander Blakely
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:14
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/0266; H05K1/0269; H10; H10H; H10H20/00; H10H20/80; H05K1/03; H05K1/0306; H05K1/09; H05K1/092; H05K2203/00; H05K2203/16; H05K2203/161; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24851; Y10T428/24917
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
63 words
A display supporting substrate which comprises a base layer of Al 2 O 3 having at least one metalization layer patterned thereon and covered by at least one insulation layer comprising a layer of Al 2 O 3 mixed with up to 20% by wt. of one of the group consisting of (1) molybdenum, (2) tungsten, (3) molybdenum oxide, and (4) tungsten oxide.
Claim 2
Dependent Claim
63 words
A display supporting substrate which comprises a base layer of Al 2 O 3 having at least one metalization layer patterned thereon and covered by at least one insulation layer comprising a layer of Al 2 O 3 mixed with up to 20% by wt. of one of the group consisting of (1) molybdenum, (2) tungsten, (3) molybdenum oxide, and (4) tungsten oxide.
Claim 3
Dependent Claim
26 words
The combination as set forth in claim 1 in which said insulating layer is formed of at least two separately deposited layers of the same mixture.
Claim 4
Dependent Claim
31 words
The combination set forth in claim 1 in which a plurality of metalization layers are formed on said substrate and are separated one from another by one of said insulation layers.
Claim 5
Dependent Claim
24 words
The combination set forth in claim 3 in which each of said insulation layers is comprised of two separately deposited layers of said mixture.
References Cited (Backward Citations)
US3556843A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-04 | 1979-11-03 | 1980-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-04 | 1983-11-03 | 1984-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-04 | 1987-11-03 | 1988-05-04 | $7700.00 | Window Closed / Lapsed |