US4339525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color proofing system using dot-etchable photopolymerizable elements
Assignee: Agfa Gevaert NV
•
Filing: 1979-12-31
•
Granted: 1982-07-13
•
Expires: 1999-12-31
Abstract
Abstract Photopolymerizable elements are described comprising a sheet support, a photopolymerizable layer having a thickness of, at most, 0.0006 inch (0.015 mm.) and an optical density of at least 3.0 in the actinic region. Resist images made from these elements may be etched by a process of chemically undercutting the image areas and then spraying or rubbing them. At least two dot-etched photopolymerizable elements, each exposed through a different color separation negative and colored accordingly, are placed in registration to form a color proofing system.
Inventors
- 👤 Martin D. Bratt
- 👤 Abraham B. Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:32
CPC Classifications
G; G03; G03F; G03F1/00; G03F1/54; G03F1/56; G03F3/00; G03F3/10; G03F3/101; G03F7/00; G03F7/26; G03F7/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
146 words
A color proofing system which comprises, in combination, at least two dot-etchable masks, in registration with each other, each mask prepared from a different color separation negative and comprising a transparent support bearing a tone correctable image no more than 0.015 mm thick comprised of addition polymerized polymeric dots having a hardened upper skin which rests on a softer undervolume having a lesser degree of polymerization or hardening, said dots having an optical density greater than 3.0 in the 350-400 nm region and being reducible in size by undercutting the polymeric dots with a solvent for the softer undervolume and removal of hardened polymer from the edges of the hardened upper skin by mechanical action on the image bearing surface of the mask, characterized in that each mask has been colored in a spectral region corresponding to the color separation negative from which it was prepared.
Claim 2
Dependent Claim
146 words
A color proofing system which comprises, in combination, at least two dot-etchable masks, in registration with each other, each mask prepared from a different color separation negative and comprising a transparent support bearing a tone correctable image no more than 0.015 mm thick comprised of addition polymerized polymeric dots having a hardened upper skin which rests on a softer undervolume having a lesser degree of polymerization or hardening, said dots having an optical density greater than 3.0 in the 350-400 nm region and being reducible in size by undercutting the polymeric dots with a solvent for the softer undervolume and removal of hardened polymer from the edges of the hardened upper skin by mechanical action on the image bearing surface of the mask, characterized in that each mask has been colored in a spectral region corresponding to the color separation negative from which it was prepared.
Claim 3
Dependent Claim
25 words
A color proofing system according to claim 1 characterized in that the dot-etchable masks and color separation negatives correspond, respectively, to yellow, magenta and cyan.
Claim 4
Dependent Claim
27 words
A color proofing system according to claim 2 characterized in that a dot-etchable mask corresponding to the grey-black separation negative is present in the combination of masks.
References Cited (Backward Citations)
US3136637A
Cited
US3887450A
Cited
US3887450B1
Cited
US3902902A
Cited
US3787211A
Cited
US3917794A
Cited
US3885963A
Cited
US4002478A
Cited
US3934057A
Cited
US3990897A
Cited
US4094679A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-07-12 | 1986-01-11 | 1986-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-12 | 1990-01-11 | 1990-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-12 | 1994-01-11 | 1994-07-13 | $7700.00 | Window Closed / Lapsed |