US4698293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for forming positive tonable images using a photosensitive material containing at least 1,4-dihydropyridine
Assignee: EIDP Inc
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Filing: 1986-11-12
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Granted: 1987-10-06
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Expires: 2006-11-12
Abstract
Abstract A process for the production of patterns that consist of powders and that are positive with respect to the original is described, according to which a light-sensitive layer containing at least one 1,4-dihydropyridine compound is exposed imagewise, treated with a strong acid, post-exposed diffusely to produce tacky areas, and is subsequently toned.
Inventors
- 👤 Mario Grossa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:31
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/26; G03F7/28; H; H05; H05K; H05K3/00; H05K3/0073
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
125 words
Process for the production of powder images that are positive with respect to an original on at least one side of a substrate bearing, on at least one side, a layer of a light-sensitive composition that contains at least one 4-(2'-nitrophenyl)-1,4-dihydropyridine compound, and/or at least one 1,4-dihydropyridine compound and at least one hexaarylbisimidazole compound, comprising, in the stated order the steps of: (a) exposing said light-sensitive layer imagewise to actinic radiation to produce tacky image areas; (b) treating the light-sensitive layer with a strong inorganic or organic acid having a pKa value ≦2.0; (c) exposing non-imagewise to actinic radiation or heating to produce tackiness in the areas not exposed to actinic radiation in step (a); and (d) toning of the tacky areas with finely-divided powders.
Claim 2
Dependent Claim
125 words
Process for the production of powder images that are positive with respect to an original on at least one side of a substrate bearing, on at least one side, a layer of a light-sensitive composition that contains at least one 4-(2'-nitrophenyl)-1,4-dihydropyridine compound, and/or at least one 1,4-dihydropyridine compound and at least one hexaarylbisimidazole compound, comprising, in the stated order the steps of: (a) exposing said light-sensitive layer imagewise to actinic radiation to produce tacky image areas; (b) treating the light-sensitive layer with a strong inorganic or organic acid having a pKa value ≦2.0; (c) exposing non-imagewise to actinic radiation or heating to produce tackiness in the areas not exposed to actinic radiation in step (a); and (d) toning of the tacky areas with finely-divided powders.
Claim 3
Dependent Claim
19 words
Process according to claim 1, wherein in step (b) the light-sensitive layer is treated with a strong volatile acid.
Claim 4
Dependent Claim
17 words
Process according to claim 1, wherein in step (b) the light-sensitive layer is treated with hydrochloric acid.
Claim 5
Dependent Claim
13 words
Process according to claim 2, wherein the strong volatile acid is hydrochloric acid.
Claim 6
Dependent Claim
22 words
Process according to claim 1, wherein in step (b) the light-sensitive layer is treated with the vapor of a strong volatile acid.
Claim 7
Dependent Claim
19 words
Process according to claim 2, wherein the light-sensitive layer is treated with the vapor of the strong volatile acid.
Claim 8
Dependent Claim
18 words
Process according to claim 3, wherein the the light-sensitive layer is treated with the vapor of hydrochloric acid.
Claim 9
Dependent Claim
24 words
Process according to claim 1, wherein in step (b) the light-sensitive layer is treated with a finely-divided carrier material charged with the strong acid.
Claim 10
Dependent Claim
22 words
Process according to claim 2, wherein the light-sensitive layer is treated with a finely-divided carrier material charged with the strong volatile acid.
Claim 11
Dependent Claim
20 words
Process according to claim 3, wherein the light-sensitive layer is treated with a finely-divided carrier material charged with hydrochloric acid.
Claim 12
Dependent Claim
23 words
Process according to claim 1, wherein in step (b) the light-sensitive layer is treated with a finely-divided silicic acid charged with hydrochloric acid.
Claim 13
Dependent Claim
20 words
Process according to claim 8, wherein the light-sensitive layer is treated with a finely-divided silicic acid charged with hydrochloric acid.
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) | 1990-10-05 | 1991-04-06 | 1991-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-05 | 1995-04-06 | 1995-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-05 | 1999-04-06 | 1999-10-06 | $7700.00 | Window Closed / Lapsed |