Patent US3655381A successfully refreshed from Google Patents.
US3655381A
Expired / Lapsed
US
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Process for the production of integrally formed, random dot photographic images
Assignee: Eastman Kodak Co
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Filing: 1969-04-24
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Granted: 1972-04-11
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Expires: 1989-04-24
Abstract
Abstract Integrally screened, random dot images are prepared with no conventional screening by using grainy images as the exposure image for high-contrast, light sensitive elements. The resultant dot images can be used directly or advantageously, for example, as a lith type image for the preparation of lithographic plates.
Inventors
- 👤 Whitelaw C Roemer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:37
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03F; G03F5/00; G03F5/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
20 words
The method of claim 1 wherein said photographic element has a silver halide sensitized gelatin emulsion on both sides thereof.
Claim 2
Dependent Claim
56 words
The invention according to claim 2 and wherein step (a) is accomplished by (i) exposing an element having a coarse grained, silver halide sensitized gelatin emulsion on at least one surface thereof directly to the light image from a continuous tone photographic image; and (ii) processing the imagewise exposed element to form a grainy image therein.
Claim 3
Dependent Claim
23 words
The invention according to claim 2 and wherein said high-contrast photosensitive element comprises a support having thereon a lith-type silver halide gelatin emulsion.
Claim 4
Dependent Claim
62 words
The invention according to claim 2 and wherein said high-contrast photosensitive element comprises a support having thereon a lith-type silver halide gelatin emulsion and further including the steps: d. exposing another light sensitive element to a light image from the random dot image produced in step (c) and e. processing the imagewise exposed element from (d) to form a second dot image.
Claim 5
Dependent Claim
19 words
The invention according to claim 5 and wherein said light sensitive element in (d) is a diazo sensitized material.
Claim 6
Dependent Claim
19 words
The invention according to claim 5 and wherein said light sensitive element in (d) is a lithographic plate material.
Claim 7
Dependent Claim
21 words
The invention according to claim 5 and wherein said light sensitive element in (d) is a silver halide sensitive photographic element.
Claim 8
Dependent Claim
18 words
The invention according to claim 5 and wherein said light sensitive element in (d) is a photoconductive element.
Claim 9
Dependent Claim
35 words
The invention according to claim 2 and wherein the grainy image in (a) has a granularity of at least about 20 and the high-contrast material in (b) has a gamma of at least about 4.
Claim 10
Dependent Claim
48 words
The invention according to claim 2 aNd wherein the grainy image in (a) has a granularity of at least about 20, the high-contrast material is a silver halide sensitized element having a gamma of at least about 8, and the processing of step (c) involves a lith-type developer.
References Cited (Backward Citations)
US1300729A
Cited
US2130735A
Cited
US3180733A
Cited
US3030209A
Cited
US3128180A
Cited
US3121010A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |