US4571373A
Expired / Lapsed
US
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Exposure latitude improvement in printing positive-acting color pre-press proofs
Assignee: 3M Co
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Filing: 1984-06-11
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Granted: 1986-02-18
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Expires: 2004-06-11
Abstract
Abstract The exposure latitude of positive-acting, color pre-press proofing photosensitive articles can be improved by positioning an optical filter between the separation half-tone positive and the photosensitive article.
Inventors
- 👤 Arlene K. Musser
- 👤 Peter M. Koelsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:08
CPC Classifications
G; G03; G03F; G03F3/00; G03F3/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
110 words
A process for improving the exposure latitude in a positive-acting color pre-press proofing photosensitive article comprising the steps of: (1) placing an optical filter between said color pre-press proofing photosensitive positive-acting article and a source of actinic radiation, said optical filter having a transmission optical density of between 0.5 and 2.5 at a major radiation absorption peak of said photosensitive article, and (2) placing a separation half-tone positive image, between said optical filter and the source of radiation, and (3) exposing said photosensitive positive-acting article with actinic radiation which passes from said source of actinic radiation and through said optical filter and said half-tone positive image to said photosensitive article.
Claim 2
Dependent Claim
110 words
A process for improving the exposure latitude in a positive-acting color pre-press proofing photosensitive article comprising the steps of: (1) placing an optical filter between said color pre-press proofing photosensitive positive-acting article and a source of actinic radiation, said optical filter having a transmission optical density of between 0.5 and 2.5 at a major radiation absorption peak of said photosensitive article, and (2) placing a separation half-tone positive image, between said optical filter and the source of radiation, and (3) exposing said photosensitive positive-acting article with actinic radiation which passes from said source of actinic radiation and through said optical filter and said half-tone positive image to said photosensitive article.
Claim 3
Dependent Claim
22 words
The process of claim 1 wherein said positive-acting photosensitive article comprises a substrate carrying a binder mixed with a positive-acting diazo oxide.
Claim 4
Dependent Claim
21 words
The process of claim 2 wherein said optical filter has a separation half-tone positive image between it and said photo-sensitive article.
Claim 5
Dependent Claim
29 words
The process of claim 1 wherein said exposing is performed on a number of identical proofing articles at different exposure intensities so that relative dot gain can be evaluated.
References Cited (Backward Citations)
US3069268A
Cited
US3671236A
Cited
US3649268A
Cited
US3661591A
Cited
US4262071A
Cited
US4506003A
Cited
US4343876A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-02-17 | 1989-08-19 | 1990-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-17 | 1993-08-19 | 1994-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-17 | 1997-08-19 | 1998-02-18 | $7700.00 | Window Closed / Lapsed |