US4154613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Positive-acting diazo type materials having photodecomposed gradient
Assignee: CNA Holdings LLC
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Filing: 1977-07-13
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Granted: 1979-05-15
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Expires: 1997-07-13
Abstract
Abstract This invention relates to an improvement in a material adapted for imagewise exposure to actinic light comprising a transparent or translucent support having a positive-acting quinone diazide light-sensitive coating composition in direct contact with one surface thereof, the improvement comprising that the surface of said coating in direct contact with said support is substantially photodecomposed, and that a gradient exists in said coating wherein the percentage of undecomposed light-sensitive quinone diazide increases with increasing distance from said support. The invention also relates to a method for preparing the novel material.
Inventors
- 👤 August P. Doering
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:01
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/227; H01J9/2271; G; G03; G03F; G03F7/00; G03F7/004; G03F7/022; G03F7/20; G03F7/2022
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
90 words
In a material comprising a transparent or translucent support having a positive-acting quinone diazide light-sensitive coating composition in direct contact with one surface thereof, said material being adapted to imagewise exposure under a mask and development by treatment with a liquid to remove exposed portions of said coating, the improvement comprising that the surface of the entire coating in direct contact with said support is substantially photodecomposed, and that a gradient exists in said coating wherein the percentage of undecomposed light-sensitive quinone diazide increases with increasing distance from said support.
Claim 2
Dependent Claim
90 words
In a material comprising a transparent or translucent support having a positive-acting quinone diazide light-sensitive coating composition in direct contact with one surface thereof, said material being adapted to imagewise exposure under a mask and development by treatment with a liquid to remove exposed portions of said coating, the improvement comprising that the surface of the entire coating in direct contact with said support is substantially photodecomposed, and that a gradient exists in said coating wherein the percentage of undecomposed light-sensitive quinone diazide increases with increasing distance from said support.
Claim 3
Dependent Claim
14 words
A material according to claim 1 in which said coating includes an opaque pigment.
Claim 4
Dependent Claim
13 words
A material according to claim 1 in which said coating includes a colorant.
Claim 5
Dependent Claim
13 words
A material according to claim 1 in which said coating includes a binder.
Claim 6
Dependent Claim
14 words
A material according to claim 4 in which said binder is a novolak resin.
Claim 7
Dependent Claim
24 words
A material according to claim 1 in which said coating has a dry weight in the range of about 0.2 to 15 grams/square meter.
Claim 8
Dependent Claim
12 words
A material according to claim 1 in which the support is glass.
Claim 9
Dependent Claim
13 words
A material according to claim 1 in which the support is a film.
Claim 10
Dependent Claim
42 words
A material according to claim 1 in which the surface of said coating in direct contact with said support is photodecomposed to the extent that the time required for imagewise exposure of said material is reduced by at least about 10 percent.
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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) | 1982-05-14 | 1982-11-13 | 1983-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-14 | 1986-11-13 | 1987-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-14 | 1990-11-13 | 1991-05-15 | $7700.00 | Window Closed / Lapsed |