US4413049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anodized electrostatic imaging surface
Assignee: Delphax Systems Inc
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Filing: 1982-02-05
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Granted: 1983-11-01
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Expires: 2002-02-05
Abstract
Abstract Dielectric sealing of porous anodized aluminum, in which moisture in the pores of the coating formed by hardcoat anodizing is removed, and the porous anodized surface then impregnated with a water insoluble metallic salt. The impregnant material is a compound of a Group II or III metal with a long chain fatty acid containing between 8 and 32 carbon atoms, saturated or unsaturated. The impregnant material may be applied as a hot melt or in solution; in the former case, any excess material is removed from the surface. The resulting product has excellent resistivity and dielectric properties, and maintains these properties at elevated humidities. As a final step the surface may be polished to provide favorable toner release characteristics during pressure transfer.
Inventors
- 👤 Leo A. Beaudet
- 👤 Donald J. Lennon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:43
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/75; G03G15/751; C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/18; C25D11/24; C25D11/246
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
120 words
An electrostatic imaging method comprising the steps of: (a) forming a latent electrostatic image on a dielectric image member, said image member being produced by: hardcoat anodizing an aluminum member to form an oxide surface layer having a plurality of pores, dehydrating the oxide surface layer to thoroughly remove water from the pores, impregnating the dehydrated surface layer with a material selected from the group consisting of compounds of Group II or Group III metals with fatty acids, while maintaining the member in a moisture-free state, and removing excess material from the member's surface; (b) toning the latent electrostatic image; (c) transferring the toned image to an image receptor solely by means of pressure exerted at the site of transfer.
Claim 2
Dependent Claim
120 words
An electrostatic imaging method comprising the steps of: (a) forming a latent electrostatic image on a dielectric image member, said image member being produced by: hardcoat anodizing an aluminum member to form an oxide surface layer having a plurality of pores, dehydrating the oxide surface layer to thoroughly remove water from the pores, impregnating the dehydrated surface layer with a material selected from the group consisting of compounds of Group II or Group III metals with fatty acids, while maintaining the member in a moisture-free state, and removing excess material from the member's surface; (b) toning the latent electrostatic image; (c) transferring the toned image to an image receptor solely by means of pressure exerted at the site of transfer.
Claim 3
Dependent Claim
29 words
The electrostatic imaging method of claim 1 wherein the image member is produced using a final step of polishing the member to a better than 20 microinch RMS finish.
Claim 4
Dependent Claim
15 words
The electrostatic imaging method of claim 1 wherein the dielectric image member comprises a cylinder.
Claim 5
Dependent Claim
36 words
The electrostatic imaging method of claim 3 wherein the image receptor comprises a sheet, and the transferring step comprises passing the image receptor sheet between the image cylinder and a transfer cylinder in rolling pressure contact.
Claim 6
Dependent Claim
23 words
The electrostatic imaging method of claim 1 wherein the transferring step accomplishes a simultaneous fusing of the toner image to the image receptor.
Claim 7
Dependent Claim
29 words
The imaging method of claim 1 wherein the aluminum member is dehydrated and impregnated while heating it to an elevated temperature above the melting point of the impregnant material.
Claim 8
Dependent Claim
25 words
The method of claim 1 wherein the member is impregnated with a material selected from the group consisting of Group II metals with fatty acids.
Claim 9
Dependent Claim
37 words
The method of claim 7 wherein the member is impregnated with a material selected from the group consisting of compounds of Group II metals with fatty acids containing between 8 and 32 carbon atoms saturated or unsaturated.
Claim 10
Dependent Claim
13 words
The method of claim 8 wherein the member is impregnated with zinc stearate.
Claim 11
Dependent Claim
33 words
The method of claim 1 wherein the impregnant material is dissolved to form an impregnant solution, and applied to the aluminum member in this form while maintaining the member in a moisture-free state.
Claim 12
Dependent Claim
135 words
An electrostatic imaging method comprising the steps of: (a) forming a latent electrostatic image on a dielectric image member, said image member being produced by: hardcoat anodizing an aluminum member to form an oxide surface layer having a plurality of pores, impregnating the pores of the oxide surface layer with a material selected from the group consisting of compounds of Group II or Group III metals with fatty acids, while maintaining the member at an elevated temperature above the melting point of said material, removing any excess material from the surface of said aluminum member, and polishing the aluminum member to a better than 20 microinch RMS finish; (b) toning the latent electrostatic image; and (c) transferring the toned image to an image receptor solely by means of pressure exerted at the site of transfer.
Claim 13
Dependent Claim
135 words
An electrostatic imaging method comprising the steps of: (a) forming a latent electrostatic image on a dielectric image member, said image member being produced by: hardcoat anodizing an aluminum member to form an oxide surface layer having a plurality of pores, impregnating the pores of the oxide surface layer with a material selected from the group consisting of compounds of Group II or Group III metals with fatty acids, while maintaining the member at an elevated temperature above the melting point of said material, removing any excess material from the surface of said aluminum member, and polishing the aluminum member to a better than 20 microinch RMS finish; (b) toning the latent electrostatic image; and (c) transferring the toned image to an image receptor solely by means of pressure exerted at the site of transfer.
Claim 14
Dependent Claim
28 words
The method of claim 11 wherein the aluminum member is impregnated with a material selected from the group consisting of compounds of Group II metals with fatty acids.
Claim 15
Dependent Claim
38 words
The method of claim 12 wherein the aluminum member is impregnated with a material selected from the group consisting of compounds of Group II metals with fatty acids containing between 8 and 32 carbon atoms, saturated or unsaturated.
Claim 16
Dependent Claim
14 words
The method of claim 13 wherein the aluminum member is impregnated with zinc stearate.
Claim 17
Dependent Claim
13 words
The method of claim 11 wherein the dielectric image member comprises a cylinder.
Claim 18
Dependent Claim
34 words
The method of claim 15 wherein the image receptor comprises a sheet, and the transferring step comprises passing the image receptor sheet between the image cylinder and a transfer cylinder in rolling pressure contact.
Claim 19
Dependent Claim
20 words
The method of claim 11 wherein in the transferring step the toned image is simultaneously fused to the image receptor.
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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) | 1986-10-31 | 1987-05-02 | 1987-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-31 | 1991-05-02 | 1991-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-31 | 1995-05-02 | 1995-11-01 | $7700.00 | Window Closed / Lapsed |