US4419426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the visual inspection of the reproduction quality of drawing elements and elements for the execution of the method
Assignee: ING R UDOLF HELL DR A GERMAN CORP GmbH
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Filing: 1980-07-15
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Granted: 1983-12-06
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Expires: 2000-07-15
Abstract
Abstract The present invention relates to a method and to elements for the execution of the method for the inspection of the reproduction quality of drawing elements which are exposed by means of a cathode ray tube on light-sensitive photo material. A simple and feasible development of the quality control of exposed photo material or other printing masters produced in this manner is achieved. The inspection ensues in that additional raster points are exposed which behave differently in response to different exposure and development conditions.
Inventors
- 👤 Christof Kehl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:54
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
180 words
A method for the visual inspection of the reproduction quality of drawing elements which are exposed by means of a cathode ray tube on light-sensitive photo material, characterized in that at least three different surface elements which are normal elements, positive elements and negative elements are exposed and such elements differ in their reaction to different processing conditions such that when under-exposed, the negative elements become weaker and when over-exposed the positive elements become stronger and with normal exposure all three elements appear the same, characterized in that said three surface elements are combined with one another such that a control field occurs which has figurative or verbal forms of expression with different processing conditions, characterized in that raster points which have the shape and form of a traditional raster point are employed as said normal elements, characterized in that raster elements which include latent intensification forms are employed as said positive elements, characterized in that raster elements which include latent weak points are employed as said negative elements, and wherein said normal element consists of a contiguous black surface.
Claim 2
Independent Claim
180 words
A method for the visual inspection of the reproduction quality of drawing elements which are exposed by means of a cathode ray tube on light-sensitive photo material, characterized in that at least three different surface elements which are normal elements, positive elements and negative elements are exposed and such elements differ in their reaction to different processing conditions such that when under-exposed, the negative elements become weaker and when over-exposed the positive elements become stronger and with normal exposure all three elements appear the same, characterized in that said three surface elements are combined with one another such that a control field occurs which has figurative or verbal forms of expression with different processing conditions, characterized in that raster points which have the shape and form of a traditional raster point are employed as said normal elements, characterized in that raster elements which include latent intensification forms are employed as said positive elements, characterized in that raster elements which include latent weak points are employed as said negative elements, and wherein said normal element consists of a contiguous black surface.
Claim 3
Dependent Claim
42 words
A method according to claim 1 wherein said positive element consists of a central contiguous black surface and latent intensifications in the form of points indicating the size of the smallest reproducible point are disposed at a distance around the black surface.
Claim 4
Dependent Claim
22 words
A method according to claim 3 wherein said positive element has latent intensifications disposed in a circle around the central black surface.
Claim 5
Dependent Claim
25 words
A method according to claim 3 wherein said positive element has intensifications disposed approximately in the corners of a rectangle surrounding the central black surface.
Claim 6
Dependent Claim
45 words
A method according to claim 1 wherein said negative element comprises a contiguous black surface in the center, and latent weak points are disposed around said central black surface in the manner of a chess board by printing small white surfaces and small black surfaces.
Claim 7
Dependent Claim
31 words
A method according to claim 1 wherein said negative element is composed of a central white surface and of strips consisting of black and white surfaces connected to said white surface.
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) | 1986-12-05 | 1987-06-06 | 1987-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-05 | 1991-06-06 | 1991-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-05 | 1995-06-06 | 1995-12-06 | $7700.00 | Window Closed / Lapsed |