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US3718397A
Expired / Lapsed
US
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Device for determining proper color balance in color printing
Assignee: Unilux Graphics Inc
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Filing: 1971-05-14
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Granted: 1973-02-27
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Expires: 1991-05-14
Abstract
Abstract A step-wedge is reprinted four times, one for each of three colors plus black and white as a mask. The reprinting is in a different position each time, giving a total of four different positions with one selected value overprinted by each color to show the effect of the overprint, namely to demonstrate a neutral. If a neutral gray is obtained, then it is known that the printing is correct. If no neutral is obtained, a ready reference, not requiring the use of a densitometer or separation filters is immediately at hand.
Inventors
- 👤 J Smajo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:04
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/10; G01J1/12; G01J1/14; G03; G03B; G03B27/00; G03B27/72
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
62 words
A color test printing target comprising a pellucid base having a plurality of patches thereon of different densities arranged in a predetermined pattern, and position determining means for sequentially positioning said base in a plurality of different positions for printing replicas of said target on a printing base in different positions with one of said patches overlapping in all of said positions.
Claim 2
Dependent Claim
62 words
A color test printing target comprising a pellucid base having a plurality of patches thereon of different densities arranged in a predetermined pattern, and position determining means for sequentially positioning said base in a plurality of different positions for printing replicas of said target on a printing base in different positions with one of said patches overlapping in all of said positions.
Claim 3
Dependent Claim
33 words
A target as set forth in claim 1 wherein said position determining means sequentially positions said base in a plurality of sequentially rotated positions, said one patch being at the center of rotation.
Claim 4
Dependent Claim
14 words
A target as set forth in claim 2 wherein the pattern is substantially T-shaped.
Claim 5
Dependent Claim
14 words
A target as set forth in claim 3 wherein said T-shape is off center.
Claim 6
Dependent Claim
46 words
The combination set forth in claim 1 wherein the position determining means comprises a plurality of keyed holes, and further including an easel having a plurality of pins thereon cooperable with said holes to position said target in exposing position relative to a sensitized printing base.
References Cited (Backward Citations)
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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) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |