Patent US4425419A successfully refreshed from Google Patents.
US4425419A
Expired / Lapsed
US
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Photosensitive composition
Assignee: Hitachi Ltd
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Filing: 1981-12-23
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Granted: 1984-01-10
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Expires: 2001-12-23
Abstract
Abstract An amphoteric surfactant is added to a photosensitive composition consisting essentially of an aromatic diazonium salt and used to prepare a fluorescent screen of a color picture tube.
Inventors
- 👤 Osamu Sasaya
- 👤 Masahiro Nishizawa
- 👤 Hiroshi Yokomizo
- 👤 Kiyoshi Miura
- 👤 Yoshifumi Tomita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:56
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/227; H01J9/2271; G; G03; G03C; G03C1/00; G03C1/52; G03C1/61; G03F; G03F7/00; G03F7/26; G03F7/28; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/22; H01J29/225
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
81 words
A dry photosensitive layer comprising a photosensitive composition containing an aromatic diazonium salt as a major constituent, characterized in that an amphoteric surfactant is added to said photosensitive composition in an amount of at least 0.01 percent by weight based on the weight of said aromatic diazonium salt and in an amount sufficient to increase the sensitivity and reduce fogging of said composition, wherein said amphoteric surfactant is selected from a group consisting of lauryl betaine, stearyl betaine and alkyl betaine.
Claim 2
Dependent Claim
81 words
A dry photosensitive layer comprising a photosensitive composition containing an aromatic diazonium salt as a major constituent, characterized in that an amphoteric surfactant is added to said photosensitive composition in an amount of at least 0.01 percent by weight based on the weight of said aromatic diazonium salt and in an amount sufficient to increase the sensitivity and reduce fogging of said composition, wherein said amphoteric surfactant is selected from a group consisting of lauryl betaine, stearyl betaine and alkyl betaine.
Claim 3
Dependent Claim
30 words
The photosensitive layer according to claim 1 wherein the amount of said amphoteric surfactant ranges from 0.01 to 15% by weight based on the weight of said aromatic diazonium salt.
Claim 4
Dependent Claim
30 words
The photosensitive layer according to claim 1 wherein the amount of said amphoteric surfactant ranges from 0.02 to 11.0% by weight based on the weight of said aromatic diazonium salt.
Claim 5
Dependent Claim
111 words
A photosensitive composition utilized to prepare a fluorescent screen of a color picture tube, characterized in that said photosensitive composition consists of 3.0% by weight of para-dimethyl aminobenzene diazonium chloride-zinc chloride double salt, 0.6% by weight of propylene glycol alginate, 0.003% by weight of a surfactant, 0.1% by weight of ethylene glycol, 0.01 to 15% by weight of an amphoteric surfactant based on the weight of said double salt, and balance of water, wherein said amphoteric surfactant is selected from a group consisting of lauryl betaine, stearyl betaine and alkyl betaine, said amphoteric surfactant being present in an amount sufficient to increase the sensitivity and to reduce fogging of the composition.
Claim 6
Dependent Claim
111 words
A photosensitive composition utilized to prepare a fluorescent screen of a color picture tube, characterized in that said photosensitive composition consists of 3.0% by weight of para-dimethyl aminobenzene diazonium chloride-zinc chloride double salt, 0.6% by weight of propylene glycol alginate, 0.003% by weight of a surfactant, 0.1% by weight of ethylene glycol, 0.01 to 15% by weight of an amphoteric surfactant based on the weight of said double salt, and balance of water, wherein said amphoteric surfactant is selected from a group consisting of lauryl betaine, stearyl betaine and alkyl betaine, said amphoteric surfactant being present in an amount sufficient to increase the sensitivity and to reduce fogging of the composition.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-09 | 1987-07-11 | 1988-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-09 | 1991-07-11 | 1992-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-09 | 1995-07-11 | 1996-01-10 | $7700.00 | Window Closed / Lapsed |