Patent US2577240A successfully refreshed from Google Patents.
US3841893A
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US
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Charge control agents for liquid developers
Assignee: Xerox Ltd
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Filing: 1972-10-13
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Granted: 1974-10-15
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Expires: 1992-10-13
Abstract
Abstract Liquid developer for developing an electrostatic latent image present on an electrostatographic imaging surface comprising an insulating liquid having dispersed therein positively charged marking particles and also containing at least one charge control agent selected from the group consisting of vinyltriethoxysilane, gamma -glycidoxypropyltrimethoxysilane, and Beta -(3,4epoxycyclohexyl)ethyltrimethoxysilane.
Inventors
- 👤 S Honjo
- 👤 H Miyatuka
- 👤 S Osawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:53
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/135; C; C10; C10M; C10M2207/00; C10M2207/10; C10M2207/12; C10M2207/121; C10M2207/122; C10M2207/125; C10M2207/129; C10M2207/28; C10M2207/281; C10M2207/282; C10M2207/283; C10M2207/286; C10M2219/00; C10M2219/06; C10M2219/062; C10M2219/066; C10M2219/068; C10M2219/08; C10M2219/082; C10M2219/083; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/041; C10M2223/042; C10M2223/045; C10M2223/047; C10N; C10N2010/00; C10N2010/02; C10N2010/04; C10N2010/08; C10N2010/10; C10N2010/14; C10N2010/16; C10N2040/00; C10N2040/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
107 words
A METHOD OF DEVELOPING AN ELECTROSTATIC LATENT IMAGE OF NEGATIVE POLARITY PRESENT ON AN IMAGING SURFACE COMPRISING CONTACTING SAID IMAGING MEMBER WITH AN ELECTROSTATOGRAPHIC LIQUID DEVELOPER COMPRISING AN INSULATING CARRIER LIQUID AND UNIFORMLY DISPERSED THEREIN FINELY DIVIDED POSITIVELY CHARGED ELECTROSCOPIC MARKING PARTICLES, SAID LIQUID DEVELOPER FURTHER COMPRISING AN AMOUNT OF A CHARGE CONTROL AGENT WHICH IS SOSOLUBLE IN SAID CARRIER LIQUID AND PRESENT IN AN AMOUNT OF FROM ABOUT 0.5 TO ABOUT 2.0 PERCENT BY VOLUME OF THE DEVELOPER, SAID AGENT BEING SELECTED FROM THE GROUP CONSISTING OF VINYLTRIETHOXYSILANE, Y-GLYCIDOXY-PROPYLTRIMETHOXYSILANE, AND B(3,4-EPOXYCYCLOHEXYL)ETHYLITRIMETHOXYSILANE AND MIXTURES THEREOF SUFFICIENT TO PROVIDE A STABLE POSITIVE CHARGE ON THE ELECTROSCOPIC MARKING PARTICLES.
Claim 2
Independent Claim
107 words
A METHOD OF DEVELOPING AN ELECTROSTATIC LATENT IMAGE OF NEGATIVE POLARITY PRESENT ON AN IMAGING SURFACE COMPRISING CONTACTING SAID IMAGING MEMBER WITH AN ELECTROSTATOGRAPHIC LIQUID DEVELOPER COMPRISING AN INSULATING CARRIER LIQUID AND UNIFORMLY DISPERSED THEREIN FINELY DIVIDED POSITIVELY CHARGED ELECTROSCOPIC MARKING PARTICLES, SAID LIQUID DEVELOPER FURTHER COMPRISING AN AMOUNT OF A CHARGE CONTROL AGENT WHICH IS SOSOLUBLE IN SAID CARRIER LIQUID AND PRESENT IN AN AMOUNT OF FROM ABOUT 0.5 TO ABOUT 2.0 PERCENT BY VOLUME OF THE DEVELOPER, SAID AGENT BEING SELECTED FROM THE GROUP CONSISTING OF VINYLTRIETHOXYSILANE, Y-GLYCIDOXY-PROPYLTRIMETHOXYSILANE, AND B(3,4-EPOXYCYCLOHEXYL)ETHYLITRIMETHOXYSILANE AND MIXTURES THEREOF SUFFICIENT TO PROVIDE A STABLE POSITIVE CHARGE ON THE ELECTROSCOPIC MARKING PARTICLES.
Claim 3
Dependent Claim
22 words
A method of developing an electrostatic latent image according to claim 1 wherein said liquid developer further comprises a resinous fixing agent.
Claim 4
Dependent Claim
19 words
A method of developing an electrostatic latent image according to claim 1 wherein said charge control agent is vinyltriethoxysilane.
Claim 5
Dependent Claim
20 words
A method of developing an electrostatic latent image according to claim 1 wherein said charge control agent is gamma -glycidoxypropyltrimethoxysilane.
Claim 6
Dependent Claim
20 words
A method of developing an electrostatic latent image according to claim 1 wherein said charge control agent is Beta -(3,4-epoxycyclohexyl)ethyltrimethoxysilane.
Claim 7
Dependent Claim
36 words
A method of developing an electrostatic latent image according to claim 1 wherein said electroscopic marking particles are present in the liquid developer in an amount of from about 2 to about 20 grams per liter.
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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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |