Patent US3660252A successfully refreshed from Google Patents.
US3660252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making engraved printing plates
Assignee: KBA Notasys SA
•
Filing: 1970-06-17
•
Granted: 1972-05-02
•
Expires: 1990-06-17
Abstract
Abstract An engraved printing plate for steel or copper plate printing machines, includes an engraved part made of a material which accepts a coloring or inking material and a non-engraved part spaced from the engraved part and having a layer of porous material impregnated with hygroscopic substance. The porous material can be black chromium or be made from nickel phosphide or alumina. The hygroscopic substance can be made from lithium chloride.
Inventors
- 👤 Gualtiero Giori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:21
CPC Classifications
B; B41; B41N; B41N3/00; B41N3/003
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
117 words
A method of treating an engraved printing plate for steel or copper plate printing machines comprising the steps of coating the engraved printing plate with a layer of material which accepts an inking material, spreading a coating of a filling material over the engraved parts of the printing plate so that the engraved parts of the printing plate are filled with the filling material, heating the filling material so that it becomes hard, coating the printing plate with a layer of porous material, removing the filling material to expose the layer of material which accepts an inking material in the engraved parts of the printing plate and impregnating the layer of porous material with a hygroscopic substance.
Claim 2
Dependent Claim
33 words
A method as claimed in claim 2, wherein the porous material is black chromium and the hygroscopic substance is lithium chloride, the black chromium being deposited on the engraved printing plate by galvanization.
Claim 3
Dependent Claim
41 words
A method as claimed in claim 2, wherein the material which accepts an inking material is copper, the copper layer having a thickness of substantially 0.002 mm, the copper layer being deposited on the engraved plate by metallization in a vacuum.
Claim 4
Dependent Claim
37 words
A method as claimed in claim 2, wherein the material which accepts an inking material is copper, the copper layer having a thickness of substantially 0.002 mm, the copper being deposited on the engraved plate by galvanization.
Claim 5
Dependent Claim
17 words
A method as claimed in claim 2, wherein the filling material is carnauba wax with a solvent.
Claim 6
Dependent Claim
24 words
A method as claimed in claim 2, wherein the engraved printing plate is polished, washed and dried after the heating of the filling material.
Claim 7
Dependent Claim
24 words
A method as claimed in claim 2, in which the filling material is removed from the engraved parts by treating it with trichlor-ethylene vapor.
Claim 8
Independent Claim
112 words
A method of treating an engraved printing plate for steel or copper plate printing machines comprising the steps of coating the engraved printing plate with a layer of copper, coating the layer of copper with a film of porous black chromium, coating the non-engraved parts of the printing plate with a layer of protective material which resists electrolytic or alkaline treatment, removing the porous black chromium by means of electrolytic or alkaline treatment from the engraved parts to expose the layer of copper, removing the protective material, to expose the porous black chromium on the non-engraved parts of the printing plate and impregnating the layer of porous black chromium with lithium chloride.
Claim 9
Dependent Claim
43 words
A method as claimed in claim 9, wherein the protective material includes an adhesive layer and bitumen powder spread on the surface of the adhesive layer, the adhesive layer and bitumen powder being heated so that a layer of solid bitumen is formed.
Claim 10
Dependent Claim
28 words
A method as claimed in claim 10, wherein the bitumen is removed by the action of nApthalene and the adhesive layer is removed by the action of phenol.
References Cited (Backward Citations)
US2245276A
Cited
US2726200A
Cited
US2907656A
Cited
US3556952A
Cited
US3478684A
Cited
US3511661A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |