Patent US5998920A successfully refreshed from Google Patents.
US5998920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conductive coating for the interior of a cathode ray tube
Assignee: Meridian Solar and Display Co Ltd
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Filing: 1997-11-25
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Granted: 1999-12-07
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Expires: 2017-11-25
Abstract
Abstract A coating for an interior of a color cathode ray tube. The coating includes a graphite, two ferric oxides, a disperser for forming a uniform mixture of the graphite and the two oxides, and an adhesive for adhering the coating on the interior of the color cathode ray tube. The first ferric oxide has no Fe2+ ions. The other ferric oxide has Fe2+ ions and has a grain diameter less than that of the first ferric oxide. The coating eliminates internal discharging of the CRT when the power is switched on or off.
Inventors
- 👤 Sang-Mun Kim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:46
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/86; H01J29/88
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
28 words
A coating for an interior of a color cathode ray tube, comprising: graphite; a first metal oxide having substantially no ions; and a second metal oxide having ions.
Claim 2
Dependent Claim
28 words
A coating for an interior of a color cathode ray tube, comprising: graphite; a first metal oxide having substantially no ions; and a second metal oxide having ions.
Claim 3
Dependent Claim
41 words
The coating for an interior of a color cathode ray tube according to claim 1, wherein said first metal oxide has a first grain diameter and said second metal oxide has a second grain diameter less than said first grain diameter.
Claim 4
Dependent Claim
30 words
The coating for an interior of a color cathode ray tube according to claim 1 wherein said first metal oxide includes a ferric oxide having substantially no Fe 2+ ions.
Claim 5
Dependent Claim
28 words
The coating for an interior of a color cathode ray tube according to claim 1, wherein said second metal oxide includes a ferric oxide having Fe 2+ ions.
Claim 6
Dependent Claim
24 words
The coating for an interior of a color cathode ray tube according to claim 1, further comprising a disperser for forming a uniform coating.
Claim 7
Dependent Claim
23 words
The coating for an interior of a color cathode ray tube according to claim 5, wherein said disperser includes polymethylene bisnaphthalene sodium sulfonate.
Claim 8
Dependent Claim
27 words
The coating for an interior of a color cathode ray tube according to claim 5, wherein said disperser includes a sodium salt of condensed naphthalene sulfonic acid.
Claim 9
Dependent Claim
25 words
The coating for an interior of a color cathode ray tube according to claim 5, wherein said disperser constitutes 0.5-6 wt % of said coating.
Claim 10
Dependent Claim
32 words
The coating for an interior of a color cathode ray tube according to claim 1, further comprising an adhesive for adhering said coating over the interior of the color cathode ray tube.
Claim 11
Dependent Claim
25 words
The coating for an interior of a color cathode ray tube according to claim 9, wherein said adhesive constitutes 5-30 wt % of said coating.
Claim 12
Dependent Claim
24 words
The coating for an interior of a color cathode ray tube according to claim 9, wherein said adhesive includes potassium silicate or sodium silicate.
Claim 13
Dependent Claim
45 words
The coating for an interior of a color cathode ray tube according to claim 1, wherein: said first metal oxide includes a first ferric oxide having substantially no Fe 2+ ions and said second metal oxide includes a second ferric oxide having Fe 2+ ions.
Claim 14
Dependent Claim
31 words
The coating for an interior of a color cathode ray tube according to claim 12, wherein said second ferric oxide having Fe 2+ ions constitutes 0.5-30 wt % of said coating.
Claim 15
Dependent Claim
27 words
The coating for an interior of a color cathode ray tube according to claim 12, wherein said first ferric oxide has a grain diameter of 0.1-20 μm.
Claim 16
Dependent Claim
29 words
The coating for an interior of a color cathode ray tube according to claim 12, wherein said second ferric oxide has a grain diameter of less than 1000 Å.
Claim 17
Dependent Claim
42 words
The coating for an interior of a color cathode ray tube according to claim 12, wherein said first ferric oxide has a grain diameter of 0.1-20 μm and wherein said second ferric oxide has a grain diameter of less than 1000 Å.
Claim 18
Dependent Claim
30 words
The coating, for an interior of a color cathode ray tube according to claim 12, wherein said second ferric oxide contains in excess of 5 wt % Fe 2+ .
Claim 19
Dependent Claim
42 words
The coating for an interior of a color cathode ray tube according to claim 12, wherein said second ferric oxide constitutes 0.5-30 wt % of said coating and said second ferric oxide contains in excess of 5 wt % Fe 2+ .
Claim 20
Dependent Claim
45 words
The coating for an interior of a color cathode ray tube according to claim 12, wherein said second ferric oxide has a grain diameter of less than 1000 Å and wherein said second ferric oxide contains in excess of 5 wt % Fe 2+ .
Claim 21
Dependent Claim
47 words
A cathode ray tube comprising: an exterior surface facing outside of said cathode ray tube; an interior surface opposite said exterior surface; and a coating over said interior surface, said coating including a first metal oxide having substantially no ions and a second metal oxide having ions.
Claim 22
Dependent Claim
47 words
A cathode ray tube comprising: an exterior surface facing outside of said cathode ray tube; an interior surface opposite said exterior surface; and a coating over said interior surface, said coating including a first metal oxide having substantially no ions and a second metal oxide having ions.
Claim 23
Dependent Claim
34 words
The cathode ray tube according to claim 20, wherein said first metal oxide has a first grain diameter and said second metal oxide has a second grain diameter less than said first grain diameter.
Claim 24
Dependent Claim
23 words
The cathode ray tube according to claim 20, wherein said first metal oxide includes a ferric oxide having substantially no Fe 2+ ions.
Claim 25
Dependent Claim
21 words
The cathode ray tube according to claim 20, wherein said second metal oxide includes a ferric oxide having Fe 2+ ions.
Claim 26
Dependent Claim
14 words
The cathode ray tube according to claim 20, wherein said coating includes a graphite.
Claim 27
Dependent Claim
19 words
The cathode ray tube according to claim 20, wherein said coating includes a disperser for forming a uniform coating.
Claim 28
Dependent Claim
27 words
The cathode ray tube according to claim 20, wherein said coating includes an adhesive for adhering said coating over the interior of the color cathode ray tube.
Claim 29
Dependent Claim
38 words
The cathode ray tube according to claim 20, wherein: said first metal oxide includes a first ferric oxide having substantially no Fe 2+ ions and said second metal oxide includes a second ferric oxide having Fe 2+ ions.
Claim 30
Dependent Claim
24 words
The cathode ray tube according to claim 27, wherein said second ferric oxide having Fe 2+ ions constitutes 0.5-30 wt % of said coating.
Claim 31
Dependent Claim
20 words
The cathode ray tube according to claim 27, wherein said first ferric oxide has a grain diameter of 0.1-20 μm.
Claim 32
Dependent Claim
22 words
The cathode ray tube according to claim 27, wherein said second ferric oxide has a grain diameter of less than 1000 Å.
Claim 33
Dependent Claim
35 words
The cathode ray tube according to claim 27, wherein said first ferric oxide has a grain diameter of 0.1-20 μm and wherein said second ferric oxide has a grain diameter of less than 1000 Å.
Claim 34
Dependent Claim
23 words
The cathode ray tube according to claim 27, wherein said second ferric oxide contains in excess of 5 wt % Fe 2+ .
Claim 35
Dependent Claim
35 words
The cathode ray tube according to claim 27, wherein said second ferric oxide constitutes 0.5-30 wt % of said coating and said second ferric oxide contains in excess of 5 wt % Fe 2+ .
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-12-06 | 2003-06-07 | 2003-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-12-06 | 2007-06-07 | 2007-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-12-06 | 2011-06-07 | 2011-12-07 | $7700.00 | Window Closed / Lapsed |