Patent US5339737A successfully refreshed from Google Patents.
US5339737A
Expired / Lapsed
US
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Lithographic printing plates for use with laser-discharge imaging apparatus
Assignee: Presstek LLC
•
Filing: 1993-05-13
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Granted: 1994-08-23
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Expires: 2013-05-13
Abstract
Abstract Lithographic printing plates suitable for imaging by means of laser devices that emit in the near-infrared region. Laser output either ablates one or more plate layers or physically transforms a surface layer, in either case resulting in an imagewise pattern of features on the plate. The image features exhibit an affinity for ink or an ink-abhesive fluid that differs from that of unexposed areas.
Inventors
- 👤 Thomas E. Lewis
- 👤 Michael T. Nowak
- 👤 Kenneth T. Robichaud
- 👤 Kenneth R. Cassidy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:31
CPC Classifications
B; B41; B41N; B41N1/00; B41N1/003; B41C; B41C1/00; B41C1/10; B41C1/1008; B41C1/1033; B41M; B41M5/00; B41M5/24; B41N1/12; B41N1/14; B41C2201/00; B41C2201/02; B41C2201/04; B41C2210/00; B41C2210/02; B41C2210/04; B41C2210/20; B41C2210/24; B41P; B41P2227/00; B41P2227/70; Y; Y10; Y10S; Y10S430/00; Y10S430/145; Y10S430/146
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
93 words
A lithographic printing member directly imageable by laser discharge, the member comprising: a. a topmost first layer which is polymeric; and b. a second layer underlying the first layer; and c. a substrate underlying the second layer; wherein d. the second layer is formed of a material which is subject to ablative absorption of imaging infrared radiation and the first layer is not; and e. the first layer and the substrate exhibit different affinities for at least one printing liquid selected from the group consisting of ink and an adhesive fluid for ink.
Claim 2
Dependent Claim
93 words
A lithographic printing member directly imageable by laser discharge, the member comprising: a. a topmost first layer which is polymeric; and b. a second layer underlying the first layer; and c. a substrate underlying the second layer; wherein d. the second layer is formed of a material which is subject to ablative absorption of imaging infrared radiation and the first layer is not; and e. the first layer and the substrate exhibit different affinities for at least one printing liquid selected from the group consisting of ink and an adhesive fluid for ink.
Claim 3
Dependent Claim
13 words
The member of claim 1 wherein the second layer is a conducting polymer.
Claim 4
Dependent Claim
16 words
The member of claim 1 wherein the second layer includes a dispersion of solid particulate nigrosine.
Claim 5
Dependent Claim
12 words
The member of claim 1 wherein the second layer includes solubilized nigrosine.
Claim 6
Dependent Claim
19 words
The member of claim 1 wherein the second layer is a nitrocellulose film containing a dispersion of carbon-black particles.
Claim 7
Dependent Claim
19 words
The member of claim 1 wherein the second layer is a polyester film containing a dispersion of carbon-black particles.
Claim 8
Dependent Claim
19 words
The member of claim 1 wherein the second layer is a polyimide film containing a dispersion of carbon-black particles.
Claim 9
Dependent Claim
19 words
The member of claim 1 wherein the second layer is a polycarbonate film containing a dispersion of carbon-black particles.
Claim 10
Dependent Claim
19 words
The member of claim 1 wherein the second layer is a vinyl film containing a dispersion of carbon-black particles.
Claim 11
Dependent Claim
14 words
The member of claim 1 wherein the substrate is at least 5 mils thick.
Claim 12
Dependent Claim
16 words
The member of claim 1 further comprising a metal layer onto which the substrate is laminated.
Claim 13
Dependent Claim
12 words
The member of claim 1 wherein the substrate is a metal layer.
Claim 14
Dependent Claim
11 words
The member of claim 1 wherein the second layer is cross-linked.
Claim 15
Dependent Claim
16 words
The member of claim 13 wherein the second layer is cross-linked by a melamine formaldehyde-based compound.
Claim 16
Dependent Claim
12 words
The member of claim 1 wherein the second layer is titanium oxide.
Claim 17
Dependent Claim
18 words
The member of claim 1 further comprising a primer layer disposed between the substrate and the second layer.
Claim 18
Dependent Claim
17 words
The member of claim 1 further comprising an infrared-reflective layer disposed between the substrate and second layer.
Claim 19
Dependent Claim
11 words
The member of claim 17 wherein the reflective layer is metal.
Claim 20
Dependent Claim
20 words
The member of claim 17 wherein the reflective layer is aluminum that reflects at least 99% of incident IR radiation.
Claim 21
Dependent Claim
16 words
The plate of claim 17 wherein the reflective layer contains a pigment that reflects IR radiation.
Claim 22
Dependent Claim
18 words
The plate of claim 1 further comprising a thin-metal, IR-absorptive layer disposed between the substrate and second layer.
Claim 23
Dependent Claim
18 words
The plate of claim 21 further comprising an adhesion-promoting layer disposed between the substrate and the thin-metal layer.
Claim 24
Dependent Claim
20 words
The plate of claim 22 wherein the substrate and the adhesion-promoting layer together represent a print- or coatability-treated polyester film.
Claim 25
Dependent Claim
23 words
The plate of claim 21 wherein the absorptive layer transmits at least 5% but not more than 70% of IR radiation incident thereon.
Claim 26
Dependent Claim
18 words
The plate of claim 1 further comprising a thin-metal, IR-absorptive layer disposed between the first and second layers.
Claim 27
Dependent Claim
23 words
The plate of claim 25 wherein the absorptive layer transmits at least 5% but not more than 70% of IR radiation incident thereon.
Claim 28
Dependent Claim
16 words
The member of claim 1 wherein the topmost layer is oleophobic and the substrate is oleophilic.
Claim 29
Dependent Claim
16 words
The member of claim 1 wherein the topmost layer is hydrophilic and the substrate is oleophilic.
Claim 30
Dependent Claim
16 words
The member of claim 1 wherein the second layer contains a dispersion of conductive carbon-black particles.
Claim 31
Dependent Claim
12 words
The member of claim 29 wherein the carbon-black particles are Vulcan XC-72.
Claim 32
Dependent Claim
13 words
The member of claim 1 wherein the substrate is transparent to infrared radiation.
Claim 33
Dependent Claim
17 words
The member of claim 31 further comprising an infrared-reflective layer disposed between the first and second layers.
Claim 34
Dependent Claim
11 words
The plate of claim 32 wherein the reflective layer is metal.
Claim 35
Dependent Claim
20 words
The member of claim 32 wherein the reflective layer is aluminum that reflects at least 99% of incident IR radiation.
Claim 36
Dependent Claim
16 words
The plate of claim 32 wherein the reflective layer contains a pigment that reflects IR radiation.
Claim 37
Dependent Claim
10 words
The member of claim 1 wherein the substrate is aluminum.
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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) | 1997-08-22 | 1998-02-21 | 1998-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-22 | 2002-02-21 | 2002-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-22 | 2006-02-21 | 2006-08-23 | $7700.00 | Window Closed / Lapsed |