US4596760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrodeposition of chromium on metal base lithographic sheet
Assignee: Individual
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Filing: 1984-08-31
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Granted: 1986-06-24
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Expires: 2004-08-31
Abstract
Abstract Electrodeposition of chromium of selectively constituted crystalline character and grain texture on metal substrates, such as aluminum or steel base lithographic sheet to provide improved and directly chromium plated aluminum or steel base lithographic sheet capable of operatively functioning as a surface plate after exposure of an applied photo sensitive coating thereon.
Inventors
- 👤 John A. Ballarini
- 👤 Timothy A. Hetland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:41
CPC Classifications
B; B41; B41N; B41N1/00; B41N1/04; B41N1/08; C; C25; C25D; C25D3/00; C25D3/02; C25D3/04; C25D5/00; C25D5/34; C25D5/42; C25D5/44; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12479; Y10T428/12486; Y10T428/12493; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/12847
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
96 words
A continuous directly electrodeposited chromium layer disposed in adherent direct interfacial engagement with the surface of a base metal substrate, said chromium layer characterized by a multiplicity of varying sized lobular nodules of less than 10 microns in diameter, each of which is progressively formed by selective deposition of discrete chromium crystallite spheroids of markedly smaller dimension upon previously desposited discrete chromium crystallite spheroids of similar dimension and further characterized by an enhanced degree of surface roughness and macroporosity and by being substantially free of polyhedric crystallites having planar exposed exterior surfaces and linear crystallite edges.
Claim 2
Dependent Claim
96 words
A continuous directly electrodeposited chromium layer disposed in adherent direct interfacial engagement with the surface of a base metal substrate, said chromium layer characterized by a multiplicity of varying sized lobular nodules of less than 10 microns in diameter, each of which is progressively formed by selective deposition of discrete chromium crystallite spheroids of markedly smaller dimension upon previously desposited discrete chromium crystallite spheroids of similar dimension and further characterized by an enhanced degree of surface roughness and macroporosity and by being substantially free of polyhedric crystallites having planar exposed exterior surfaces and linear crystallite edges.
Claim 3
Dependent Claim
30 words
An electrodeposited chromium layer as set forth in claim 1 further characterized by an anisotropic and discontinuous exposed surface and a labyrinthine undersurface structure accessible through said macroporous surface structure.
Claim 4
Dependent Claim
27 words
An electrodeposited chromium layer as set forth in claim 2 wherein said base metal substrate is selected from the group consisting of alumium and steel base alloy.
Claim 5
Dependent Claim
32 words
A continuous electrodeposited chromium layer on a metal substrate as set forth in claim 1, further including a layer of photo sensitive material disposed in overlying relation on said electrodeposited chromium layer.
Claim 6
Dependent Claim
32 words
A continuous electrodeposited chromium layer on a metal substrate as set forth in claim 4, further including a layer of photo sensitive material disposed in overlying relation on said electrodeposited chromium layer.
Claim 7
Dependent Claim
185 words
A lithographic sheet comprising, a base metal substrate selected from the group consisting of aluminum and steel base alloy, a continuous directly electrodeposited chromium layer disposed in adherent direct interfacial engagement with the surface of said base metal substrate characterized by a multiplicity of varying size lobular nodules of less than 10 microns in diameter, each of which is progressively formed by selective deposition of discrete chromium crystallite spheroids of markedly smaller dimension upon previously deposited discrete chromium crystallite spheroids of similar dimension and further characterized by an enhanced degree of surface roughness and macroporosity and by being substantially free of polyhedric crystallites having planar exposed exterior surfaces and linear crystallite edges, said chromium layer being further characterized by an anisotropic and discontinuous exposed surface and a labyrinthine undersurface accessible through said macroporous surface structure, and a layer of photosensitive material disposed in overlying relation with said electrodeposited chromium layer, whereby the adherent direct interfacial engagement of said electrodeposited chromium layer with said base metal substrate permits usage of said lithographic sheet as a surface plate subsequent to exposure and development of said photosensitive coating.
Claim 8
Dependent Claim
185 words
A lithographic sheet comprising, a base metal substrate selected from the group consisting of aluminum and steel base alloy, a continuous directly electrodeposited chromium layer disposed in adherent direct interfacial engagement with the surface of said base metal substrate characterized by a multiplicity of varying size lobular nodules of less than 10 microns in diameter, each of which is progressively formed by selective deposition of discrete chromium crystallite spheroids of markedly smaller dimension upon previously deposited discrete chromium crystallite spheroids of similar dimension and further characterized by an enhanced degree of surface roughness and macroporosity and by being substantially free of polyhedric crystallites having planar exposed exterior surfaces and linear crystallite edges, said chromium layer being further characterized by an anisotropic and discontinuous exposed surface and a labyrinthine undersurface accessible through said macroporous surface structure, and a layer of photosensitive material disposed in overlying relation with said electrodeposited chromium layer, whereby the adherent direct interfacial engagement of said electrodeposited chromium layer with said base metal substrate permits usage of said lithographic sheet as a surface plate subsequent to exposure and development of said photosensitive coating.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-23 | 1989-12-23 | 1990-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-23 | 1993-12-23 | 1994-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-23 | 1997-12-23 | 1998-06-24 | $7700.00 | Window Closed / Lapsed |