Patent US4701387A successfully refreshed from Google Patents.
US4701387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plural-stage liquid development of electrostatic charge patterns
Assignee: Eastman Kodak Co
•
Filing: 1986-07-16
•
Granted: 1987-10-20
•
Expires: 2006-07-16
Abstract
Abstract In plural-stage liquid development of electrostatic charge patterns, as in multicolor electro-photography, image defects occur in areas of the image which are undeveloped or background areas of a previous development stage. The method of the invention avoids such defects by rinsing the image with a polar liquid between development stages to remove counterions which are believed to cause the defects.
Inventors
- 👤 Peter S. Alexandrovich
- 👤 Domenic Santilli
- 👤 Yee S. Ng
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:17
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G13/00; G03G13/06; G03G13/10; G03G15/00; G03G15/01; G03G15/0142; G03G15/0147; G03G15/0152; G03G15/0157
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
105 words
The method of plural-stage liquid development of electrostatic charge patterns which comprises forming an electrostastic charge pattern on an insulating surface of an electrostatic recording element, developing the charge pattern with a liquid developer comprising an insulating carrier liquid, a toner and an ionic charge-control agent, rinsing the developed surface of the element with a polar rinse liquid which is not a solvent for the toner or for the surface of the recording element, forming a second electrostatic charge pattern on the element which extends into areas of the surface not previously developed with toner, and developing the second charge pattern with a liquid developer.
Claim 2
Independent Claim
105 words
The method of plural-stage liquid development of electrostatic charge patterns which comprises forming an electrostastic charge pattern on an insulating surface of an electrostatic recording element, developing the charge pattern with a liquid developer comprising an insulating carrier liquid, a toner and an ionic charge-control agent, rinsing the developed surface of the element with a polar rinse liquid which is not a solvent for the toner or for the surface of the recording element, forming a second electrostatic charge pattern on the element which extends into areas of the surface not previously developed with toner, and developing the second charge pattern with a liquid developer.
Claim 3
Dependent Claim
26 words
The method of claim 1 wherein the polar rinse liquid contains a compound selected from the group consisting of oleic acid, linoleic acid and naphthenic acid.
Claim 4
Dependent Claim
124 words
The method of claim 1 which comprises uniformly charging an insulating surface of a photoconductive element, exposing the surface to a pattern of actinic radiation to form a latent electrostatic image, developing the latent image with a liquid developer comprising an insulating carrier liquid, a toner and an ionic charge-control agent, rinsing the developed surface of the polar rinse liquid which is not a solvent for the toner or for the surface of the photoconductive element, thereafter again charging the surface of the photoconductive element, again exposing the element to a pattern of actinic radiation to form a second latent electrostatic image which extends into areas of the surface not previously developed with toner, and developing the second latent image with a liquid developer.
Claim 5
Dependent Claim
35 words
The method of claim 3 wherein the toners in the different developers are of different colors and wherein the polar rinse liquid comprises a volatile hydrocarbon liquid and, as a polar component, a carboxylic acid.
Claim 6
Dependent Claim
32 words
The method of claim 4, wherein the polar component is oleic acid, linoleic acid or a naphthenic acid in a concentration from 0.5 to 3.5 weight percent of the polar rinse liquid.
Claim 7
Dependent Claim
17 words
The method of claim 5, wherein the charge-control agent of the developer is a polymeric organo-lithium compound.
Claim 8
Dependent Claim
31 words
The method of claim 5 wherein the polar rinse liquid consists essentially of a paraffinic hydrocarbon liquid and from 0.7 to 2 weight percent oleic acid, linoleic acid or naphthenic acid.
Claim 9
Dependent Claim
27 words
The method of claim 4 wherein the surface of the photoconductive element is dried after rinsing with the polar rinse liquid and before the next development step.
Claim 10
Dependent Claim
27 words
The method of claim 1 wherein an electrical bias sufficient to aid in avoiding counterion deposits is applied while rinsing the element with a polar rinse liquid.
References Cited (Backward Citations)
DE1930008A1
Cited
US3577259A
Cited
US3971659A
Cited
US3692523A
Cited
GB1278858A
Cited
US3738832A
Cited
US3806340A
Cited
JPS4926902A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-19 | 1991-04-20 | 1991-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-19 | 1995-04-20 | 1995-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-19 | 1999-04-20 | 1999-10-20 | $7700.00 | Window Closed / Lapsed |