US5551341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lithographic printing plates for use with laser discharge imaging apparatus
Assignee: Presstek LLC
•
Filing: 1995-06-07
•
Granted: 1996-09-03
•
Expires: 2015-06-07
Abstract
Abstract Apparatus and methods for imaging lithographic plates using laser devices that emit in the near-infrared region, and plates suitable for imaging with the apparatus and methods. 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
- 👤 Richard A. Williams
- 👤 Frank G. Pensavecchia
- 👤 John F. Kline
- 👤 John P. Gardiner
- 👤 Michael T. Nowak
- 👤 Kenneth T. Robichaud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:56
CPC Classifications
B; B41; B41N; B41N1/00; B41N1/003; B41C; B41C1/00; B41C1/10; B41C1/1008; B41C1/1033; B41J; B41J19/00; B41J19/18; B41J19/20; B41J2/00; B41J2/435; B41J2/447; B41J2/45; B41J2/451; B41J2/47; 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; Y10S430/165
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
101 words
A lithographic printing member directly imageable by laser discharge, the member comprising: a. a first solid layer; b. a second solid layer underlying the first layer; c. a solid substrate underlying the second layer; and wherein e. the first layer and substrate exhibit different affinities for at least one printing liquid selected from the group consisting of ink and an abhesive fluid for ink; f. the second layer, but not the first layer, is formed of a material being subject to ablative absorption of imaging radiation; and g. at least one layer disposed beneath the second solid layer reflects imaging radiation.
Claim 2
Dependent Claim
101 words
A lithographic printing member directly imageable by laser discharge, the member comprising: a. a first solid layer; b. a second solid layer underlying the first layer; c. a solid substrate underlying the second layer; and wherein e. the first layer and substrate exhibit different affinities for at least one printing liquid selected from the group consisting of ink and an abhesive fluid for ink; f. the second layer, but not the first layer, is formed of a material being subject to ablative absorption of imaging radiation; and g. at least one layer disposed beneath the second solid layer reflects imaging radiation.
Claim 3
Dependent Claim
13 words
The member of claim 1 wherein the second layer is a conducting polymer.
Claim 4
Dependent Claim
19 words
The member of claim 2 wherein the second layer is a polycarbonate film containing a dispersion of carbon-black particles.
Claim 5
Dependent Claim
16 words
The member of claim 1 wherein the second layer includes a dispersion of solid particulate nigrosine.
Claim 6
Dependent Claim
12 words
The member of claim 1 wherein the second layer includes solubilized nigrosine.
Claim 7
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 8
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 9
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 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 7 mils thick.
Claim 12
Dependent Claim
107 words
A lithographic printing member directly imageable by laser discharge, the member comprising: a. a first solid layer; b. a second solid layer underlying the first layer; c. a solid substrate underlying the second layer; and d. a fourth layer disposed between the second layer and the substrate and comprising a material that reflects imaging radiation, wherein e. the first layer and substrate exhibit different affinities for at least one printing liquid selected from the group consisting of ink and an adhesive fluid for ink; and f. the second layer, but not the first layer, is formed of a material being subject to ablative absorption of imaging radiation.
Claim 13
Dependent Claim
107 words
A lithographic printing member directly imageable by laser discharge, the member comprising: a. a first solid layer; b. a second solid layer underlying the first layer; c. a solid substrate underlying the second layer; and d. a fourth layer disposed between the second layer and the substrate and comprising a material that reflects imaging radiation, wherein e. the first layer and substrate exhibit different affinities for at least one printing liquid selected from the group consisting of ink and an adhesive fluid for ink; and f. the second layer, but not the first layer, is formed of a material being subject to ablative absorption of imaging radiation.
References Cited (Backward Citations)
US2875051A
Cited
US3945830A
Cited
CA1050805A
Cited
US4357403A
Cited
US4911075A
Cited
JPH03154063A
Cited
JPH0470658A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-09-03 | 2000-03-04 | 2000-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-09-03 | 2004-03-04 | 2004-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-09-03 | 2008-03-04 | 2008-09-03 | $7700.00 | Window Closed / Lapsed |