Patent US5366759A successfully refreshed from Google Patents.
US5366759A
Expired / Lapsed
US
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Method of lacquering the luminophore layer of a color picture tube
Assignee: Panasonic Holdings Corp
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Filing: 1992-07-01
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Granted: 1994-11-22
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Expires: 2012-07-01
Abstract
Abstract The following steps are performed in a method of lacquering the luminophore layer of a color picture tube: the luminophore layer is first prewetted, a first aqueous dispersion of a lacquer is applied to the prewetted luminophore layer, this first dispersion is fully dried and heated to above the film formation temperature of the lacquer, thereby producing a first lacquer film, a second aqueous dispersion is applied directly to the first lacquer film, where the said second aqueous dispersion has exactly the same components as the first dispersion and the concentration of the components in the second dispersion corresponds at least to a large extent to the concentration of these components in the first dispersion, and this second dispersion is fully dried and heated to above the film formation temperature of the lacquer, thereby producing a second lacquer film. This two-stage lacquering process makes it possible obtain screen brightnesses that are about 10% greater than can be obtained by means of conventional single-stage lacquering methods.
Inventors
- 👤 Heinz Beckerle
- 👤 Rolf Reidinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:22
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/50; B05D7/52; B05D7/54; B05D7/546; B05D1/00; B05D1/002; H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/28
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
145 words
A method of lacquering the luminophore layer on the screen trough of a colour picture tube, wherein a first aqueous dispersion of a lacquer is applied to the luminophore layer, the first dispersion is fully dried and heated to above the film formation temperature of the lacquer, thereby producing a first lacquer film, a second aqueous dispersion of a lacquer is applied to the lacquer film, and this second dispersion is fully dried and heated to above the film formation temperature, thereby producing a second lacquer film characterized in that identical components are used for both dispersions and the concentration of the components in the second dispersion is less than the concentration of the components in the first dispersion, and the luminophore layer is prewetted before the first aqueous dispersion is applied, while the second aqueous dispersion is applied directly to the first lacquer film.
Claim 2
Independent Claim
145 words
A method of lacquering the luminophore layer on the screen trough of a colour picture tube, wherein a first aqueous dispersion of a lacquer is applied to the luminophore layer, the first dispersion is fully dried and heated to above the film formation temperature of the lacquer, thereby producing a first lacquer film, a second aqueous dispersion of a lacquer is applied to the lacquer film, and this second dispersion is fully dried and heated to above the film formation temperature, thereby producing a second lacquer film characterized in that identical components are used for both dispersions and the concentration of the components in the second dispersion is less than the concentration of the components in the first dispersion, and the luminophore layer is prewetted before the first aqueous dispersion is applied, while the second aqueous dispersion is applied directly to the first lacquer film.
Claim 3
Dependent Claim
61 words
A method in accordance with claim 1, characterized in that at least the second dispersion is sprayed from below against the rotating luminophore layer, which is either in a vertical position or points obliquely downwards, and on completion of the spraying--the screen trough is set to rotate at a high speed in order to distribute the dispersion over the first film.
Claim 4
Dependent Claim
23 words
A method in accordance with claim 1, characterized in that further films of lacquer are applied in the same way as the second.
Claim 5
Dependent Claim
23 words
Method in accordance with claim 2, characterized in that further films of lacquer are applied in the same way as the second film.
Claim 6
Dependent Claim
32 words
A method in accordance with claim 1, characterized in that the concentration of the components in the second dispersion is nearly equal to the concentration of the components in the first dispersion.
Claim 7
Dependent Claim
25 words
A method in accordance with claim 1, characterized in that the concentration of the components in the second dispersion is not less than two percent.
Claim 8
Dependent Claim
37 words
A method in accordance with claim 1, characterized in that the concentration of the components in the second dispersion is approximately 6.5 percent, and the concentration of the components in the first dispersion is approximately 9.5 percent.
Claim 9
Dependent Claim
37 words
A method in accordance with claim 1, characterized in that the concentration of the components in the first dispersion is approximately 10 percent, and the concentration of the components in the second dispersion is approximately 8.5 percent.
References Cited (Backward Citations)
US3652323A
Cited
DE2329741A1
Cited
DE2450834A1
Cited
US4139657A
Cited
US4196015A
Cited
US4542038A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-11-21 | 1998-05-23 | 1998-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-11-21 | 2002-05-23 | 2002-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-11-21 | 2006-05-23 | 2006-11-22 | $7700.00 | Window Closed / Lapsed |