Patent US4059481A successfully refreshed from Google Patents.
US4059481A
Expired / Lapsed
US
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Method of making an intaglio halftone gravure printing plate
Assignee: Dai Nippon Printing Co Ltd
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Filing: 1976-07-12
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Granted: 1977-11-22
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Expires: 1996-07-12
Abstract
Abstract An intaglio halftone gravure printing plate is made by contact-printing onto a sensitized carbon tissue a contact screen including a grid-like arrangement of minute dark dots each having the shape of a square rounded off at the four corners with the peripheries vignetted and having densities tapering from a maximum value of 3.0 at the center to a minimum value of 0.1 at the periphery, contact-printing a halftone positive onto the carbon tissue, contact-printing a light diffusion sheet and the halftone positive combinedly onto the carbon tissue, and developing the treated carbon tissue on a printing plate for subsequent etching of the cylinder.
Inventors
- 👤 Katsusuke Nagano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:14
CPC Classifications
G; G03; G03F; G03F5/00; G03F5/20
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
151 words
A method of making an intaglio halftone gravure printing plate comprising the steps of: contact-printing onto a sensitized carbon tissue a contact screen including a grid-like arrangement of minute dark dots each having the shape of a square rounded off at the four corners with a vignetted periphery and having densities tapering from a maximum value of 3.0 at the central part to a minimum value of 0.1 at the periphery; contact-printing in registration a halftone positive onto the carbon tissue; superposing a light diffusion sheet and the halftone positive on the carbon tissue in the order named, and contact-printing in registration the light diffusion sheet and the halftone positive combinedly onto the carbon tissue; said steps being carried out in any desired order; applying the thus treated carbon tissue to a printing plate to develop the tissue thereon; and etching the printing plate to obtain the halftone gravure printing plate.
Claim 2
Independent Claim
151 words
A method of making an intaglio halftone gravure printing plate comprising the steps of: contact-printing onto a sensitized carbon tissue a contact screen including a grid-like arrangement of minute dark dots each having the shape of a square rounded off at the four corners with a vignetted periphery and having densities tapering from a maximum value of 3.0 at the central part to a minimum value of 0.1 at the periphery; contact-printing in registration a halftone positive onto the carbon tissue; superposing a light diffusion sheet and the halftone positive on the carbon tissue in the order named, and contact-printing in registration the light diffusion sheet and the halftone positive combinedly onto the carbon tissue; said steps being carried out in any desired order; applying the thus treated carbon tissue to a printing plate to develop the tissue thereon; and etching the printing plate to obtain the halftone gravure printing plate.
Claim 3
Dependent Claim
101 words
The method of making an intaglio halftone gravure printing plate as claimed in claim 1, further including the step of superposing a light mask in the form of a vignetted negative directly on the carbon tissue before said light diffusion sheet and said halftone positive are superposed on the carbon tissue, and contact-printing in registration the light mask, the light diffusion sheet and the halftone positive onto the carbon tissue, portions of said light mask which correspond to portions of the halftone positive of halftone dot percentages between 5 and 8% having a continuously varying tone below a density of 0.6.
Claim 4
Dependent Claim
96 words
The method of making an intaglio halftone gravure printing plate as claimed in claim 1, further including the step of interposing a light mask in the form of a vignetted negative between said light diffusion sheet and said halftone positive on the carbon tissue, and contact-printing the light diffusion sheet, the light mask and the halftone positive superposed in this order onto the carbon tissue, portions of said light mask which correspond to portions of the halftone positive of halftone dot percentages between 5 and 8% having a continuous varying tone below a density of 0.6.
Claim 5
Dependent Claim
66 words
The method of making an intaglio halftone gravure printing plate as claimed in claim 2 wherein said light mask has a density of zero in its portions corresponding to portions of the halftone positive of halftone dot percentages above 8%, and has a maximum density of 0.6 in its portions corresponding to portions of the halftone positive of halftone dot percentages of and below about 5%.
Claim 6
Dependent Claim
66 words
The method of making an intaglio halftone gravure printing plate as claimed in claim 3 wherein said light mask has a density of zero in its portions corresponding to portions of the halftone positive of halftone dot percentages above 8%, and has a maximum density of 0.6 in its portions corresponding to portions of the halftone positive of halftone dot percentages of and below about 5%.
Claim 7
Dependent Claim
28 words
The method of making an intaglio halftone gravure printing plate as claimed in claim 1 wherein said halftone positive is of the type for use in offset printing.
Claim 8
Dependent Claim
26 words
The method of making an intaglio halftone gravure printing plate as claimed in claim 1 wherein said diffusion sheet is a matted film of synthetic resin.
Claim 9
Dependent Claim
24 words
The method of making an intaglio halftone gravure printing plate as claimed in claim 1 wherein said diffusion sheet is a light diffusion glass.
Claim 10
Dependent Claim
87 words
The method of making an intaglio halftone gravure printing plate as claimed in claim 1 wherein the contact-printing of said halftone positive on the carbon tissue is carried out with a quantity of exposure of the order of 60 to 90% of the quantity of exposure for the contact screen printing, and the contact-printing of said diffusion sheet and said halftone positive is carried out with a quantity of exposure of the order of 40 to 60% of the quantity of exposure for the contact screen printing.
Claim 11
Dependent Claim
37 words
The method of making an intaglio halftone gravure printing plate as claimed in claim 1 wherein said diffusion sheet has a light transmissivity of between 60 to 90% and a thickness of between 50 to 100 μ.
Claim 12
Dependent Claim
48 words
The method of making an intaglio halftone gravure printing plate as claimed in Claim 1 wherein said etching is carried out with a ferric chloride solution consisting essentially of at least one inorganic iron salt selected from the group consisting of ferrous sulfate, ferric sulfate and ferric nitrate.
Claim 13
Dependent Claim
69 words
The method of making an intaglio halftone gravure printing plate as claimed in claim 1 wherein said etching is carried out with a ferric chloride solution containing a mixture of alkaline solution of at least one amino acid selected from the group consisting of phenylalanine, alanine and glycine, and of at least one inorganic copper salt selected from the group consisting of copper sulfate, cupric chloride and cupric nitrate.
References Cited (Backward Citations)
US2060640A
Cited
US2480400A
Cited
US2731346A
Cited
US3325285A
Cited
US3600244A
Cited
US3689417A
Cited
US3650957A
Cited
US3752073A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-21 | 1981-05-23 | 1981-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-21 | 1985-05-23 | 1985-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-21 | 1989-05-23 | 1989-11-22 | $7700.00 | Window Closed / Lapsed |