US4783385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic masks for tonal correction
Assignee: EIDP Inc
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Filing: 1987-03-31
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Granted: 1988-11-08
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Expires: 2007-03-31
Abstract
Abstract Process for production of photographic masks for tonal correction by dry dot etching comprising exposing a mask film, e.g., positive film, behind a film combination of half-tone positives and negatives that contains at least one pair of a positive and a negative of the same color separation, said pair being separated from one another by a spacer film, e.g., transparent, matt film, etc. The half-tone values at the points to be corrected are in the range of 30-70%.
Inventors
- 👤 Gerhard F. Duesdieker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:28
CPC Classifications
G; G03; G03F; G03F3/00; G03F3/04; G03F3/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
99 words
Process for the production of photographic masks for tonal correction by dry dot etching comprising (A) exposing a silver halide photographic mask film behind a film combination, bound in accurate register, of a half-tone positive and half-tone negative of a color separation set and diffusion sheets, characterized in that the film combination comprises at least one pair of a positive and a negative of the same color separation, whereby the positive and negative are separated from one another by a film taken from the group consisting of spacer film and color separation film, and (B) developing the mask film.
Claim 2
Dependent Claim
99 words
Process for the production of photographic masks for tonal correction by dry dot etching comprising (A) exposing a silver halide photographic mask film behind a film combination, bound in accurate register, of a half-tone positive and half-tone negative of a color separation set and diffusion sheets, characterized in that the film combination comprises at least one pair of a positive and a negative of the same color separation, whereby the positive and negative are separated from one another by a film taken from the group consisting of spacer film and color separation film, and (B) developing the mask film.
Claim 3
Dependent Claim
27 words
Process according to claim 1 wherein the positive-negative pair of color separations used have half-tone values at the points to be corrected in the range of 30-70%.
Claim 4
Dependent Claim
27 words
Process according to claim 1 wherein the positive-negative pair of color separations used have half-tone values at the points to be corrected in the range of 40-60%.
Claim 5
Dependent Claim
33 words
Process according to claim 1 wherein the film combination contains up to five half-tone positives and -negatives, wherein at least one of them is a positive-negative pair belonging to the same color separation.
Claim 6
Dependent Claim
41 words
Process according to claim 1 wherein the spacer film is taken from the group consisting of transparent film, matted film, film support of a color separation, and combinations thereof and the thickness of the spacer film is 100 to 200 μm.
Claim 7
Dependent Claim
15 words
Process according to claim 1 wherein the film combination contains at least two diffusion sheets.
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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) | 1991-11-08 | 1992-05-09 | 1992-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-08 | 1996-05-09 | 1996-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-08 | 2000-05-09 | 2000-11-08 | $7700.00 | Window Closed / Lapsed |