Patent US4851091A successfully refreshed from Google Patents.
US4851091A
Expired / Lapsed
US
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Process for producing support for lithographic printing plate
Assignee: Fujifilm Holdings Corp
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Filing: 1987-01-05
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Granted: 1989-07-25
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Expires: 2007-01-05
Abstract
Abstract A process for producing a support for a lithographic printing plate is disclosed, comprising mechanically graining a sheet for the support with abrasive grains which have sharp-angled tips having a radius of not more than 20 μm. The process is suitable for mass production, and the lithographic printing plate produced from the resulting support is excellent in stain-resistance and printing durability.
Inventors
- 👤 Akio Uesugi
- 👤 Kazutaka Oda
- 👤 Tsutomu Kakei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:49
CPC Classifications
B; B41; B41N; B41N3/00; B41N3/04
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
35 words
A process for producing a support for lithographic printing plate, which comprises mechanically graining a sheet for the support with abrasive grains which have sharpangled tips having a radius of not more than 20 μm.
Claim 2
Dependent Claim
35 words
A process for producing a support for lithographic printing plate, which comprises mechanically graining a sheet for the support with abrasive grains which have sharpangled tips having a radius of not more than 20 μm.
Claim 3
Dependent Claim
19 words
A process as in claim 1, wherein said abrasive grains have a specific gravity of not less than 2.5.
Claim 4
Dependent Claim
22 words
A process as in claim 2, wherein said mechanical graining is followed by at least one of chemical etching and electro-chemical graining.
Claim 5
Dependent Claim
55 words
A process as in claim 2, wherein said mechanical graining is carried out by jetting a high-pressure liquid from at least one nozzle at a high flow rate, joining a slurry containing said abrasive grains with the jetted highpressure liquid stream, and directing the resulting mixed stream to strike against a surface of the sheet.
Claim 6
Dependent Claim
22 words
A process as in claim 4, wherein said high-pressure liquid is jetted at a flow rate of from 70 to 120 m/sec.
Claim 7
Dependent Claim
25 words
A process as in claim 5, wherein said abrasive grains are contained in said slurry in an amount of from 30 to 50% by weight.
Claim 8
Dependent Claim
28 words
A process as in claim 5, wherein the resulting mixed stream is directed to strike the surface of the sheet at an angle of from 30° to 150°.
Claim 9
Dependent Claim
23 words
A process as in claim 4, wherein the pressure for producing the jetted high-pressure liquid is from 30 to 50 kg/cm 2 .
Claim 10
Dependent Claim
25 words
A process as in claim 4, wherein said abrasive grains are contained in said slurry in an amount of from 30 to 50% by weight.
Claim 11
Dependent Claim
28 words
A process as in claim 4, wherein the resulting mixed stream is directed to strike the surface of the sheet at an angle of from 30° to 150°.
Claim 12
Dependent Claim
22 words
A process as in claim 1, wherein said mechanical graining is followed by at least one of chemical etching and electro-chemical graining.
Claim 13
Dependent Claim
55 words
A process as in claim 1, wherein said mechanical graining is carried out by jetting a high-pressure liquid from at least one nozzle at a high flow rate, joining a slurry containing said abrasive grains with the jetted highpressure liquid stream, and directing the resulting mixed stream to strike against a surface of the sheet.
Claim 14
Dependent Claim
22 words
A process as in claim 12, wherein said high-pressure liquid is jetted at a flow rate of from 70 to 120 m/sec.
Claim 15
Dependent Claim
25 words
A process as in claim 13, wherein said abrasive grains are contained in said slurry in an amount of from 30 to 50% by weight.
Claim 16
Dependent Claim
28 words
A process as in claim 13, wherein the resulting mixed stream is directed to strike the surface of the sheet at an angle of from 30° to 150°.
Claim 17
Dependent Claim
23 words
A process as in claim 12, wherein the pressure for producing the jetted high-pressure liquid is from 30 to 50 kg/cm 2 .
Claim 18
Dependent Claim
25 words
A process as in claim 12, wherein said abrasive grains are contained in said slurry in an amount of from 30 to 50% by weight.
Claim 19
Dependent Claim
28 words
A process as in claim 12, wherein the resulting mixed stream is directed to strike the surface of the sheet at an angle of from 30° to 150°.
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) | 1992-07-24 | 1993-01-23 | 1993-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-24 | 1997-01-23 | 1997-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-24 | 2001-01-23 | 2001-07-25 | $7700.00 | Window Closed / Lapsed |