US3928038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making multi-color intaglio plates and cylinders for use in gravure printing
Assignee: Intaglio Service Corp
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Filing: 1974-02-28
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Granted: 1975-12-23
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Expires: 1994-02-28
Abstract
Abstract In a photogravure process for making sets of intaglio plates for use in multi-color gravure printing a special type of halftone screen is used in a special manner. Said screens are characterized by closely spaced parallel lines of connected dots extending in a single direction as distinguished from crossed lines of discrete dots as in halftone screens used in offset lithography, and from the crossed solid lines of the screens commonly used in photogravure processes. A set of such screens is assembled with a set of continuous tone color separated positive transparencies with the lines of connected dots of each screen arranged at an angle to the horizontal which is different from the angle to the horizontal at which the corresponding lines of connected dots of each other screen are arranged. The said assemblies are then exposed separately onto photosensitive material and the latent images are transferred onto a copper plate in conventional manner and the plates are then etched in conventional manner.
Inventors
- 👤 Michael J Bergin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:43
CPC Classifications
G; G03; G03F; G03F5/00; G03F5/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
104 words
A PROCESS OF MAKING A SET OF COLOR SEPARATED INTAGLIO PLATES FOR USE IN MULTI-COLOR GRAVURE PRINTING WHICH COMPRISES THE STEPS OF MAKING A SET OF CONTINUOUS TONE COLOR SEPARATED POSITIVE TRANSPARENCIES EACH OF WHICH BEARS A COLOR SEPARATED IMAGE CORRESPONDING TO A SPECIFIC COLOR DIFFERENT FROM THE SPECIFIC COLOR OF EACH OTHER IMAGE, AND ASSEMBLING EACH OF SAID TRANSPARENCIES SEPARATELY WITH A TRANSPARENT HALFTONE SCREEN HAING CLOSELY SPACED PARALLEL LINES OF CONNECTED OPAQUE DOTS EXTENDING IN A SINGLE DIRECTION, SAID DOTS BEING OF A LENGTH GREATER THAN THEIR WIDTH AND WITH SUCCESSIVE DOTS CONNECTED BY NARROW NECKS OF A WIDTH SUBSTANTIALLY LESS THAN
Claim 2
Dependent Claim
104 words
A PROCESS OF MAKING A SET OF COLOR SEPARATED INTAGLIO PLATES FOR USE IN MULTI-COLOR GRAVURE PRINTING WHICH COMPRISES THE STEPS OF MAKING A SET OF CONTINUOUS TONE COLOR SEPARATED POSITIVE TRANSPARENCIES EACH OF WHICH BEARS A COLOR SEPARATED IMAGE CORRESPONDING TO A SPECIFIC COLOR DIFFERENT FROM THE SPECIFIC COLOR OF EACH OTHER IMAGE, AND ASSEMBLING EACH OF SAID TRANSPARENCIES SEPARATELY WITH A TRANSPARENT HALFTONE SCREEN HAING CLOSELY SPACED PARALLEL LINES OF CONNECTED OPAQUE DOTS EXTENDING IN A SINGLE DIRECTION, SAID DOTS BEING OF A LENGTH GREATER THAN THEIR WIDTH AND WITH SUCCESSIVE DOTS CONNECTED BY NARROW NECKS OF A WIDTH SUBSTANTIALLY LESS THAN
Claim 3
Dependent Claim
25 words
A process according to claim 1 in which the maximum width of said dots is less than the distance between opposed dots of adjacent lines.
Claim 4
Dependent Claim
25 words
A process according to claim 1 in which all of said lines of connected dots are arranged at angles to the horizontal which exceed 45*.
Claim 5
Dependent Claim
164 words
A process according to claim 1 in which said set of continuous tone positive transparencies includes one bearing a yellow image, one bearing a red image, one bearing a blue image and one bearing a black image, and in which the lines of connected dots of the screen assembled with the transparency bearing the yellow image are arranged at an angle of 75* ( + or -3*) to the horizontal, the lines of connected dots of the screen assembled with the transparency bearing the red image are arranged at an angle of 49* ( + or - 3*) tO the horizontal, the lines of connected dots of the screen assembled with the transparency bearing the blue image are arranged at an angle of 90* ( + or - 3*) to the horizontal, and the lines of connected dots of the screen assembled with the transparency bearing the black image are arranged at an angle of 107* ( + or - 3*) to the horizontal.
Claim 6
Dependent Claim
51 words
A process according to claim 1 which includes the step of exposing each of the said assemblies onto photosensitive material to form a latent image thereon, transferring each of said latent images onto a separate copper plate, and etching each of the said plates separately to form an intaglio image therein.
Claim 7
Dependent Claim
167 words
A photogravure process for making a set of color separated intaglio plates for use in multi-color gravure printing in which a set of continuous tone color separated positive transparencies, each of which bears a color separated image corresponding to a specific color different from the specific color of each other image is assembled with a set of halftone screens, and in which each assembly is exposed separately onto photosensitive material to form a latent image therein, in which the improvement comprises assembling each of said continuous tone color separated positive transparencies separately with a transparent halftone screen having closely spaced lines of connected dots, said dots being of a length greater than their width and with successive dots connected by narrow necks of a width substantially less than the maximum width of the dots with each screen arranged at an angle to the horizontal which is different from the angle to the horizontal at which the corresponding lines of connected dots of each other screen are arranged.
Claim 8
Dependent Claim
167 words
A photogravure process for making a set of color separated intaglio plates for use in multi-color gravure printing in which a set of continuous tone color separated positive transparencies, each of which bears a color separated image corresponding to a specific color different from the specific color of each other image is assembled with a set of halftone screens, and in which each assembly is exposed separately onto photosensitive material to form a latent image therein, in which the improvement comprises assembling each of said continuous tone color separated positive transparencies separately with a transparent halftone screen having closely spaced lines of connected dots, said dots being of a length greater than their width and with successive dots connected by narrow necks of a width substantially less than the maximum width of the dots with each screen arranged at an angle to the horizontal which is different from the angle to the horizontal at which the corresponding lines of connected dots of each other screen are arranged.
Claim 9
Dependent Claim
25 words
A process according to claim 6 in which the maximum width of said dots is less than the distance between opposed dots of adjacent lines.
Claim 10
Dependent Claim
25 words
A process according to claim 6 in which all of said lines of connected dots are arranged at angles to the horizontal which exceed 45*.
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) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |