Patent US3793018A successfully refreshed from Google Patents.
US3793018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvements in cleaning electrophotographic imaging surfaces
Assignee: Agfa Gevaert NV
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Filing: 1972-05-19
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Granted: 1974-02-19
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Expires: 1992-05-19
Abstract
Abstract In an electrophotographic reproduction process in which an electrostatic image is formed on a surface, developed with powder particles, the particle image transferred to a reception material and the surface re-used to form further images, the cleaning of the surface as with a brush or fibrous web before re-use of the surface is facilitated by applying to the surface at least one hydrophobic bivalent or trivalent metal salt of a half ester of a branched-chain or straight-chain aliphatic dicarboxylic acid or of a mono- or di-ester of a phophorus oxyacid. The metal salt can be deposited on the surface prior to formation of any image thereon or after transfer of the powder particle image.
Inventors
- 👤 Engeland J Van
- 👤 Roo P De
- 👤 Besauw J Van
- 👤 A Poot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:11
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/005; G03G21/00; G03G21/0005
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
45 words
A process according to claim 1 wherein said metal salt is applied by depositing the same on said imaging surface prior to the formation of said electrostatic latent image, whereby said salt remains on said surface during the formation and development of such latent image.
Claim 2
Dependent Claim
27 words
A process according to claim 1 comprising applying said metal salt to said imaging surface subsequent to the transfer of the powder image to a receptor surface.
Claim 3
Dependent Claim
20 words
A process according to claim 3 comprising applying said metal salt to said imaging surface and cleaning such surface simultaneously.
Claim 4
Dependent Claim
43 words
A process according to claim 1 wherein said metal salt is applied to the imaging surface by wiping said surface for a certain period of time with an applicator member carrying such salt on at least the side thereof which contacts such surface.
Claim 5
Dependent Claim
21 words
A process according to claim 5 wherein said applicator member comprises a fibrous web which makes contact with said imaging surface.
Claim 6
Dependent Claim
38 words
A process according to claim 5 wherein before contact of the surface of said applicator member with the imaging surface, said applicator surface carries said metal salt in an amount between 0.005 g and 5 g per sq.m.
Claim 7
Dependent Claim
14 words
A process according to claim 1 wherein said metal salt is a zinc salt.
Claim 8
Dependent Claim
20 words
A process according to claim 1 wherein said aliphatic chain is a hydrocarbon group containing at least 10 carbon atoms.
Claim 9
Dependent Claim
39 words
A process according to claim 9 wherein said aliphatic chain is a hydrocarbon group present in the ester portion of the compound or as a substituent on the radical linking the two carboxylic acid groups of the dicarboxylic acid.
Claim 10
Dependent Claim
19 words
A process according to claim 1 wherein said salt is a salt of a half ester of succinic acid.
Claim 11
Dependent Claim
115 words
In an electrophotographic imaging process comprising forming an electrostatic image on a surface, developing said image by means of powder, and subsequently transferring said powder image from said surface to a receptor material, the improvement wherein the surface on which said electrostatic image is formed carries a deposit thereon of at least one compound of the group consisting of a bivalent or trivalent metal salt of a half ester of a branched-chain or straight-chain aliphatic dicarboxylic acid containing an aliphatic hydrocarbon group of at least five carbon atoms and a bivalent or trivalent metal salt of a mono-ester or di-ester of a phosphorus oxyacid containing an aliphatic hydrocarbon group of at least five carbon atoms.
Claim 12
Dependent Claim
16 words
An electrophotographic imaging process according to claim 12 wherein said metal salt is a zinc salt.
Claim 13
Dependent Claim
22 words
An electrophotographic imaging process according to claim 12 wherein said aliphatic chain is a hydrocarbon group of at least 10 carbon atoms.
Claim 14
Dependent Claim
49 words
An electrophotographic imaging process according to claim 12 wherein said aliphatic chain is a hydrocarbon group of at least five carbon atoms which is present in the ester portion of the compound or as a substituent on the radical linking the two carboxylic acid groups of the dicarboxylic acid.
Claim 15
Dependent Claim
21 words
An electrophotographic imaging process according to claim 12 wherein said salt is a salt of a half ester of succinic acid.
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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |