Patent US4501806A successfully refreshed from Google Patents.
US4501806A
Expired / Lapsed
US
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Method for forming pattern and photoresist used therein
Assignee: Toshiba Corp
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Filing: 1982-09-01
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Granted: 1985-02-26
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Expires: 2002-09-01
Abstract
Abstract A method for forming a pattern of a non-light-emitting black material on the inner surface of a faceplate of a color cathode ray tube is provided, which comprises the steps of: forming a photoresist layer of a photoresist containing a water-soluble bisazidocompound, a water-soluble diazocompound, and a water-soluble polymeric material, on an inner surface of a faceplate of a color cathode ray tube; selectively exposing parts of the photoresist layer using a shadow mask so as to photocure the exposed parts; developing the photoresist layer to remove unexposed parts of the photoresist layer, thereby forming dots of the photoresist; forming a film of a non-light-emitting black material on the inner surface of the faceplate including the dots; and removing the dots and the non-light-emitting black material on the dots so as to form holes in the film of the non-light-emitting black material.
Inventors
- 👤 Shingo Watanabe
- 👤 Takeo Itou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:00
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/227; H01J9/2278; G; G03; G03F; G03F7/00; G03F7/004; G03F7/09; G03F7/095
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
178 words
A method of forming a pattern, comprising the steps of: (a) forming a photoresist layer of a photoresist containing a water-soluble bisazidocompound, a water-soluble diazocompound, and a water-soluble polymeric material, on an inner surface of a faceplate of a color cathode ray tube, said water-soluble polymeric material being a mixture of polyvinyl pyrrolidone and polyvinyl alcohol in a mixing ratio by weight of polyvinyl pyrrolidone to polyvinyl alcohol within the range of 0.5 to 3, and a mixing ratio by weight of said water-soluble bisazidocompound to said water-soluble diazocompound within the range of 3 to 7; (b) selectively exposing parts of said photoresist layer using a shadow mask so as to photocure said parts; (c) developing said photoresist layer to remove unexposed parts of said photoresist layer, thereby forming dots of said photoresist; (d) forming a film of a non-light-emitting black material on said inner surface of said faceplate including said dots; and (e) removing said dots and said non-light-emitting black material on said dots so as to form holes in said film of said non-light-emitting black material.
Claim 2
Independent Claim
178 words
A method of forming a pattern, comprising the steps of: (a) forming a photoresist layer of a photoresist containing a water-soluble bisazidocompound, a water-soluble diazocompound, and a water-soluble polymeric material, on an inner surface of a faceplate of a color cathode ray tube, said water-soluble polymeric material being a mixture of polyvinyl pyrrolidone and polyvinyl alcohol in a mixing ratio by weight of polyvinyl pyrrolidone to polyvinyl alcohol within the range of 0.5 to 3, and a mixing ratio by weight of said water-soluble bisazidocompound to said water-soluble diazocompound within the range of 3 to 7; (b) selectively exposing parts of said photoresist layer using a shadow mask so as to photocure said parts; (c) developing said photoresist layer to remove unexposed parts of said photoresist layer, thereby forming dots of said photoresist; (d) forming a film of a non-light-emitting black material on said inner surface of said faceplate including said dots; and (e) removing said dots and said non-light-emitting black material on said dots so as to form holes in said film of said non-light-emitting black material.
Claim 3
Dependent Claim
22 words
The method according to claim 1 in which the water-soluble bisazidocompound is 4,4'-diazidostilbene-2,2'-disulfonic acid, 4,4'-diazidobenzalacetophenone-2-sulfonic acid, 4,4'-diazidostilbene-2-carboxylic acid, or a salt thereof.
Claim 4
Dependent Claim
38 words
The method according to claim 1 in which the water-soluble diazocompound is benzidine tetrazonium chloride, 3,3'-dimethylbenzidine tetrazonium chloride, 3,3'-dimethoxybenzidine tetrazonium chloride, 4,4'-diaminodiphenylamine tetrazonium chloride, 3,3'-diethylbenzidine tetrazonium sulfate, a formalin condensation product of diazodiphenylamine, or a double salt thereof.
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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) | 1988-02-26 | 1988-08-27 | 1989-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-26 | 1992-08-27 | 1993-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-26 | 1996-08-27 | 1997-02-26 | $7700.00 | Window Closed / Lapsed |