Patent US4981765A successfully refreshed from Google Patents.
US4981765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal transfer printer for producing a photomask
Assignee: Novartis Corp
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Filing: 1988-08-08
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Granted: 1991-01-01
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Expires: 2008-08-08
Abstract
Abstract The invention relates to the use of a thermal transfer printer and of an ink ribbon containing a pigment or dye that absorbs light in the range from 350 to 450 nm for the direct production of a photomask from an electronically coded sources of information on a metal plate (PS plate) coated with a positively working photopolymer which is sensitive to light in the range from 350 to 450 nm, and, as surface layer, with a polymer which is soluble in alkaline solution and is permeable to light in the range from 350 to 450 nm, such that the image produced by the thermal transfer printer on the PS plate is used direct as photomask.
Inventors
- 👤 Jin Mizuguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:22
CPC Classifications
G; G03; G03F; G03F1/00; G03F1/68; H; H05; H05K; H05K3/00; H05K3/0002
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
149 words
A process for the direct production of a photomask from electronically coded sources of information on a metal presensitized plate coated with a positively working photopolymer which is sensitive to light in the range of 350 to 450 nm, and, as a surface layer, with a polymer which is soluble in alkaline solution and is permeable to light in the range of 350 to 450 nm, such that the image produced by the thermal transfer printer on the metal presensitized plate is used directly as a photomask, wherein the image is made by a thermal transfer printer from an ink ribbon containing a pigment or a dye that absorbs light in the range of 350 to 450 nm by imagewise printing said plate with ink ribbon, irradiating the printed plate with light in the range from 350 to 450 nm and developing said plate in an alkaline developer solution.
Claim 2
Dependent Claim
149 words
A process for the direct production of a photomask from electronically coded sources of information on a metal presensitized plate coated with a positively working photopolymer which is sensitive to light in the range of 350 to 450 nm, and, as a surface layer, with a polymer which is soluble in alkaline solution and is permeable to light in the range of 350 to 450 nm, such that the image produced by the thermal transfer printer on the metal presensitized plate is used directly as a photomask, wherein the image is made by a thermal transfer printer from an ink ribbon containing a pigment or a dye that absorbs light in the range of 350 to 450 nm by imagewise printing said plate with ink ribbon, irradiating the printed plate with light in the range from 350 to 450 nm and developing said plate in an alkaline developer solution.
Claim 3
Dependent Claim
37 words
A process according to claim 1, wherein the ink ribbon contains a yellow, red, green or black pigment or a yellow, red, green or black dye that absorbs light in the range from 350 to 450 nm.
Claim 4
Dependent Claim
18 words
A process according to claim 2, wherein the ink ribbon contains a yellow pigment or a yellow dye.
Claim 5
Dependent Claim
26 words
A process according to claim 1, wherein the ink ribbon contains a blue pigment or a blue dye and a fluorescent whitening agent or UV absorber.
Claim 6
Dependent Claim
15 words
A process according to claim 1, wherein the ink ribbon is a melting type ribbon.
Claim 7
Dependent Claim
35 words
A process according to claim 5, wherein the ink ribbon contains about 20% by weight of a pigment, about 60 to 80% by weight of wax, and 0 to 20% by weight of conventional auxiliaries.
Claim 8
Dependent Claim
43 words
A process according to claim 6, wherein the ink ribbon additionally contains about 5% by weight of a fluorescent whitening agent or of a UV absorber which absorbs light in the range of the spectrum in which the photopolymer is sensitive to light.
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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) | 1993-12-31 | 1994-07-02 | 1995-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-31 | 1998-07-02 | 1999-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-31 | 2002-07-02 | 2003-01-01 | $7700.00 | Window Closed / Lapsed |